diff --git a/drafthorse/models/accounting.py b/drafthorse/models/accounting.py
index 0d2aa56..421a6f3 100644
--- a/drafthorse/models/accounting.py
+++ b/drafthorse/models/accounting.py
@@ -1,3 +1,4 @@
+from .container import CurrencyContainer, Container
 from . import BASIC, COMFORT, EXTENDED, NS_RAM
 from .elements import Element
 from .fields import (
@@ -148,7 +149,7 @@ class MonetarySummation(Element):
     tax_total = CurrencyField(
         NS_RAM, "TaxTotalAmount", required=True, profile=BASIC, _d="Steuergesamtbetrag"
     )
-    tax_total_other_currency = MultiCurrencyField(
+    tax_total_other_currency: CurrencyContainer = MultiCurrencyField(
         NS_RAM, "TaxTotalAmount", profile=EXTENDED, _d="Steuergesamtbetrag"
     )
     rounding_amount = DecimalField(
@@ -239,7 +240,7 @@ class TradeAllowanceCharge(Element):
     )
     reason_code = StringField(NS_RAM, "ReasonCode", required=False, profile=COMFORT)
     reason = StringField(NS_RAM, "Reason", required=False, profile=COMFORT)
-    trade_tax = MultiField(CategoryTradeTax, required=False, profile=COMFORT)
+    trade_tax: Container = MultiField(CategoryTradeTax, required=False, profile=COMFORT)
 
     class Meta:
         namespace = NS_RAM
diff --git a/drafthorse/models/delivery.py b/drafthorse/models/delivery.py
index e568b08..c51ab96 100644
--- a/drafthorse/models/delivery.py
+++ b/drafthorse/models/delivery.py
@@ -35,7 +35,9 @@ class Meta:
 
 
 class SupplyChainConsignment(Element):  # TODO: Deprecated?
-    movement = Field(LogisticsTransportMovement, required=False, profile=EXTENDED)
+    movement: LogisticsTransportMovement = Field(
+        LogisticsTransportMovement, required=False, profile=EXTENDED
+    )
 
     class Meta:
         namespace = NS_RAM
@@ -43,20 +45,26 @@ class Meta:
 
 
 class TradeDelivery(Element):
-    consignment = Field(
+    consignment: SupplyChainConsignment = Field(
         SupplyChainConsignment,
         default=False,
         required=False,
         _d="Detailinformationen zur Konsignation oder Sendung",
     )
-    ship_to = Field(ShipToTradeParty, required=False, profile=EXTENDED)
-    ultimate_ship_to = Field(UltimateShipToTradeParty, required=False, profile=EXTENDED)
-    ship_from = Field(ShipFromTradeParty, required=False, profile=EXTENDED)
-    event = Field(SupplyChainEvent, required=False, profile=BASIC)
-    despatch_advice = Field(
+    ship_to: ShipToTradeParty = Field(
+        ShipToTradeParty, required=False, profile=EXTENDED
+    )
+    ultimate_ship_to: UltimateShipToTradeParty = Field(
+        UltimateShipToTradeParty, required=False, profile=EXTENDED
+    )
+    ship_from: ShipFromTradeParty = Field(
+        ShipFromTradeParty, required=False, profile=EXTENDED
+    )
+    event: SupplyChainEvent = Field(SupplyChainEvent, required=False, profile=BASIC)
+    despatch_advice: DespatchAdviceReferencedDocument = Field(
         DespatchAdviceReferencedDocument, required=False, profile=EXTENDED
     )
-    delivery_note = Field(
+    delivery_note: DeliveryNoteReferencedDocument = Field(
         DeliveryNoteReferencedDocument, required=False, profile=EXTENDED
     )
 
diff --git a/drafthorse/models/document.py b/drafthorse/models/document.py
index 4b0e923..67a7920 100644
--- a/drafthorse/models/document.py
+++ b/drafthorse/models/document.py
@@ -1,6 +1,7 @@
 import xml.etree.cElementTree as ET
 
-from drafthorse.models.note import IncludedNote
+from .container import StringContainer, Container
+from .note import IncludedNote
 
 from . import BASIC, EXTENDED, NS_A, NS_QDT, NS_RAM, NS_RSM, NS_UDT
 from .elements import Element
@@ -35,13 +36,13 @@ class DocumentContext(Element):
     test_indicator = IndicatorField(
         NS_RAM, "TestIndicator", required=False, profile=EXTENDED, _d="Testkennzeichen"
     )
-    business_parameter = Field(
+    business_parameter: BusinessDocumentContextParameter = Field(
         BusinessDocumentContextParameter,
         required=False,
         profile=EXTENDED,
         _d="Geschäftsprozess, Wert",
     )
-    guideline_parameter = Field(
+    guideline_parameter: GuidelineDocumentContextParameter = Field(
         GuidelineDocumentContextParameter,
         required=True,
         profile=BASIC,
@@ -79,8 +80,10 @@ class Header(Element):
         profile=EXTENDED,
         _d="Indikator Original/Kopie",
     )
-    languages = MultiStringField(NS_RAM, "LanguageID", required=False, profile=EXTENDED)
-    notes = MultiField(IncludedNote)
+    languages: StringContainer = MultiStringField(
+        NS_RAM, "LanguageID", required=False, profile=EXTENDED
+    )
+    notes: Container = MultiField(IncludedNote)
     effective_period = Field(
         EffectivePeriod,
         required=False,
@@ -94,9 +97,9 @@ class Meta:
 
 
 class Document(Element):
-    context = Field(DocumentContext, required=True)
-    header = Field(Header, required=True)
-    trade = Field(TradeTransaction, required=True)
+    context: DocumentContext = Field(DocumentContext, required=True)
+    header: Header = Field(Header, required=True)
+    trade: TradeTransaction = Field(TradeTransaction, required=True)
 
     def __init__(self):
         super().__init__()
diff --git a/drafthorse/models/note.py b/drafthorse/models/note.py
index 9cd5b5f..b8df3b3 100644
--- a/drafthorse/models/note.py
+++ b/drafthorse/models/note.py
@@ -1,3 +1,4 @@
+from .container import StringContainer
 from . import BASIC, COMFORT, EXTENDED, NS_RAM
 from .elements import Element
 from .fields import MultiStringField, StringField
@@ -5,7 +6,9 @@
 
 class IncludedNote(Element):
     content_code = StringField(NS_RAM, "ContentCode", required=False, profile=EXTENDED)
-    content = MultiStringField(NS_RAM, "Content", required=False, profile=BASIC)
+    content: StringContainer = MultiStringField(
+        NS_RAM, "Content", required=False, profile=BASIC
+    )
     subject_code = StringField(NS_RAM, "SubjectCode", required=False, profile=COMFORT)
 
     class Meta:
diff --git a/drafthorse/models/party.py b/drafthorse/models/party.py
index c6ae5a7..54adfa5 100644
--- a/drafthorse/models/party.py
+++ b/drafthorse/models/party.py
@@ -1,5 +1,6 @@
 from . import BASIC, COMFORT, EXTENDED, NS_RAM
 from .elements import Element
+from .container import Container, IDContainer
 from .fields import Field, IDField, MultiField, MultiIDField, StringField
 
 
@@ -68,7 +69,9 @@ class LegalOrganization(Element):
         profile=BASIC,
         _d="Firmenname, sofern abweichend vom Namen",
     )
-    trade_address = Field(PostalTradeAddress, required=False, profile=EXTENDED)
+    trade_address: PostalTradeAddress = Field(
+        PostalTradeAddress, required=False, profile=EXTENDED
+    )
 
     class Meta:
         namespace = NS_RAM
@@ -80,9 +83,9 @@ class TradeContact(Element):
     department_name = StringField(
         NS_RAM, "DepartmentName", required=False, profile=EXTENDED
     )
-    telephone = Field(PhoneNumber, required=False, profile=EXTENDED)
-    fax = Field(FaxNumber, required=False, profile=EXTENDED)
-    email = Field(EmailURI, required=False, profile=EXTENDED)
+    telephone: PhoneNumber = Field(PhoneNumber, required=False, profile=EXTENDED)
+    fax: FaxNumber = Field(FaxNumber, required=False, profile=EXTENDED)
+    email: EmailURI = Field(EmailURI, required=False, profile=EXTENDED)
 
     class Meta:
         namespace = NS_RAM
@@ -93,7 +96,7 @@ class TradeParty(Element):
     id = StringField(
         NS_RAM, "ID", required=False, profile=COMFORT, _d="Kennung des Handelspartners"
     )
-    global_id = MultiIDField(
+    global_id: IDContainer = MultiIDField(
         NS_RAM,
         "GlobalID",
         required=False,
@@ -108,28 +111,30 @@ class TradeParty(Element):
         profile=COMFORT,
         _d="Zusätzliche rechliche Informationen des Handelspartners",
     )
-    legal_organization = Field(
+    legal_organization: LegalOrganization = Field(
         LegalOrganization,
         required=False,
         profile=BASIC,
         _d="Handelsinformationen des Handelspartners",
     )
-    contact = Field(
+    contact: TradeContact = Field(
         TradeContact,
         required=False,
         profile=EXTENDED,
         _d="Ansprechpartner des Handelspartners",
     )
-    address = Field(
+    address: PostalTradeAddress = Field(
         PostalTradeAddress,
         required=False,
         profile=BASIC,
         _d="Anschrift des Handelspartners",
     )
-    electronic_address = MultiField(
+    electronic_address: Container = MultiField(
         URIUniversalCommunication, required=False, profile=BASIC
     )
-    tax_registrations = MultiField(TaxRegistration, required=False, profile=BASIC)
+    tax_registrations: Container = MultiField(
+        TaxRegistration, required=False, profile=BASIC
+    )
 
 
 class SellerTaxRepresentativeTradeParty(TradeParty):
diff --git a/drafthorse/models/payment.py b/drafthorse/models/payment.py
index 613fc99..71f3b59 100644
--- a/drafthorse/models/payment.py
+++ b/drafthorse/models/payment.py
@@ -1,5 +1,6 @@
 from . import BASIC, COMFORT, EXTENDED, NS_RAM
 from .elements import Element
+from .container import StringContainer, CurrencyContainer
 from .fields import (
     DateTimeField,
     DecimalField,
@@ -48,13 +49,13 @@ class Meta:
 
 class PaymentMeans(Element):
     type_code = StringField(NS_RAM, "TypeCode", required=True, profile=COMFORT)
-    information = MultiStringField(
+    information: StringContainer = MultiStringField(
         NS_RAM, "Information", required=False, profile=COMFORT
     )
-    financial_card = Field(FinancialCard)
-    payer_account = Field(PayerFinancialAccount)
-    payee_account = Field(PayeeFinancialAccount)
-    payee_institution = Field(PayeeFinancialInstitution)
+    financial_card: FinancialCard = Field(FinancialCard)
+    payer_account: PayerFinancialAccount = Field(PayerFinancialAccount)
+    payee_account: PayeeFinancialAccount = Field(PayeeFinancialAccount)
+    payee_institution: PayeeFinancialInstitution = Field(PayeeFinancialInstitution)
 
     class Meta:
         namespace = NS_RAM
@@ -182,20 +183,20 @@ class PaymentTerms(Element):
     debit_mandate_id = StringField(
         NS_RAM, "DirectDebitMandateID", required=False, profile=BASIC
     )
-    partial_amount = MultiCurrencyField(
+    partial_amount: CurrencyContainer = MultiCurrencyField(
         NS_RAM,
         "PartialPaymentAmount",
         profile=EXTENDED,
         required=False,
         _d="Betrag der Teilzahlung",
     )
-    penalty_terms = Field(
+    penalty_terms: PaymentPenaltyTerms = Field(
         PaymentPenaltyTerms,
         required=False,
         profile=EXTENDED,
         _d="Detailinformationen zu Zahlungszuschlägen",
     )
-    discount_terms = Field(
+    discount_terms: PaymentDiscountTerms = Field(
         PaymentDiscountTerms,
         required=False,
         profile=EXTENDED,
diff --git a/drafthorse/models/product.py b/drafthorse/models/product.py
index 9a49cd5..61dbbf0 100644
--- a/drafthorse/models/product.py
+++ b/drafthorse/models/product.py
@@ -1,4 +1,5 @@
 from . import COMFORT, EXTENDED, NS_RAM
+from .container import Container
 from .elements import Element
 from .fields import (
     ClassificationField,
@@ -94,11 +95,17 @@ class TradeProduct(Element):
     )
     name = StringField(NS_RAM, "Name", required=False)
     description = StringField(NS_RAM, "Description", required=False, profile=COMFORT)
-    characteristics = MultiField(ProductCharacteristic, required=False, profile=COMFORT)
-    classifications = MultiField(ProductClassification, required=False, profile=COMFORT)
-    instance = MultiField(ProductInstance, required=False, profile=EXTENDED)
-    origins = MultiField(OriginCountry, required=False, profile=COMFORT)
-    included_products = MultiField(ReferencedProduct, required=False, profile=EXTENDED)
+    characteristics: Container = MultiField(
+        ProductCharacteristic, required=False, profile=COMFORT
+    )
+    classifications: Container = MultiField(
+        ProductClassification, required=False, profile=COMFORT
+    )
+    instance: Container = MultiField(ProductInstance, required=False, profile=EXTENDED)
+    origins: Container = MultiField(OriginCountry, required=False, profile=COMFORT)
+    included_products: Container = MultiField(
+        ReferencedProduct, required=False, profile=EXTENDED
+    )
 
     class Meta:
         namespace = NS_RAM
diff --git a/drafthorse/models/trade.py b/drafthorse/models/trade.py
index 99c9302..bc62796 100644
--- a/drafthorse/models/trade.py
+++ b/drafthorse/models/trade.py
@@ -8,6 +8,7 @@
     TradeAllowanceCharge,
 )
 from .delivery import TradeDelivery
+from .container import Container
 from .elements import Element
 from .fields import DateTimeField, DecimalField, Field, MultiField, StringField
 from .party import (
@@ -59,28 +60,38 @@ class TradeAgreement(Element):
         profile=COMFORT,
         _d="Referenz des Käufers",
     )
-    seller = Field(
+    seller: SellerTradeParty = Field(
         SellerTradeParty, required=True, _d="Detailinformationen zum Verkäufer"
     )
-    buyer = Field(BuyerTradeParty, required=True)
-    end_user = Field(
+    buyer: BuyerTradeParty = Field(BuyerTradeParty, required=True)
+    end_user: EndUserTradeParty = Field(
         EndUserTradeParty, required=False, _d="Abweichender Endverbraucher"
     )
-    delivery_terms = Field(DeliveryTerms, required=False, profile=EXTENDED)
-    seller_order = Field(SellerOrderReferencedDocument, required=False, profile=COMFORT)
-    buyer_order = Field(BuyerOrderReferencedDocument, required=False)
-    customer_order = Field(
+    delivery_terms: DeliveryTerms = Field(
+        DeliveryTerms, required=False, profile=EXTENDED
+    )
+    seller_order: SellerOrderReferencedDocument = Field(
+        SellerOrderReferencedDocument, required=False, profile=COMFORT
+    )
+    buyer_order: BuyerOrderReferencedDocument = Field(
+        BuyerOrderReferencedDocument, required=False
+    )
+    customer_order: UltimateCustomerOrderReferencedDocument = Field(
         UltimateCustomerOrderReferencedDocument, required=False, profile=COMFORT
     )
-    contract = Field(ContractReferencedDocument, required=False, profile=COMFORT)
-    additional_references = MultiField(
+    contract: ContractReferencedDocument = Field(
+        ContractReferencedDocument, required=False, profile=COMFORT
+    )
+    additional_references: Container = MultiField(
         AdditionalReferencedDocument, required=False, profile=COMFORT
     )
     description = StringField(NS_RAM, "Description", required=False, profile=COMFORT)
-    seller_tax_representative_party = Field(
+    seller_tax_representative_party: SellerTaxRepresentativeTradeParty = Field(
         SellerTaxRepresentativeTradeParty, required=False
     )
-    procuring_project_type = Field(ProcuringProjectType, required=False)
+    procuring_project_type: ProcuringProjectType = Field(
+        ProcuringProjectType, required=False
+    )
 
     class Meta:
         namespace = NS_RAM
@@ -102,7 +113,7 @@ class LogisticsServiceCharge(Element):
         profile=COMFORT,
         _d="Betrag der Servicegebühr",
     )
-    trade_tax = MultiField(AppliedTradeTax, required=False, profile=COMFORT)
+    trade_tax: Container = MultiField(AppliedTradeTax, required=False, profile=COMFORT)
 
     class Meta:
         namespace = NS_RAM
@@ -151,7 +162,7 @@ class AdvancePayment(Element):
     received_date = DateTimeField(
         NS_RAM, "FormattedReceivedDateTime", date_time_namespace=NS_QDT
     )
-    included_trade_tax = MultiField(IncludedTradeTax)
+    included_trade_tax: Container = MultiField(IncludedTradeTax)
 
     class Meta:
         namespace = NS_RAM
@@ -166,48 +177,54 @@ class TradeSettlement(Element):
     )
     currency_code = StringField(NS_RAM, "InvoiceCurrencyCode")
     issuer_reference = StringField(NS_RAM, "InvoiceIssuerReference", profile=EXTENDED)
-    invoicer = Field(
+    invoicer: InvoicerTradeParty = Field(
         InvoicerTradeParty, required=False, profile=EXTENDED, _d="Rechnungsaussteller"
     )
-    invoicee = Field(
+    invoicee: InvoiceeTradeParty = Field(
         InvoiceeTradeParty, required=False, profile=EXTENDED, _d="Rechnungsempfänger"
     )
-    payee = Field(
+    payee: PayeeTradeParty = Field(
         PayeeTradeParty, required=False, profile=BASIC, _d="Zahlungsempfänger"
     )
-    payer = Field(
+    payer: PayerTradeParty = Field(
         PayerTradeParty, required=False, profile=EXTENDED, _d="Zahlungspflichtiger"
     )
-    invoice_currency = Field(TaxApplicableTradeCurrencyExchange, profile=EXTENDED)
-    payment_means = Field(PaymentMeans)
-    trade_tax = MultiField(ApplicableTradeTax)
-    period = Field(BillingSpecifiedPeriod, required=False, profile=BASIC)
-    allowance_charge = MultiField(
+    invoice_currency: TaxApplicableTradeCurrencyExchange = Field(
+        TaxApplicableTradeCurrencyExchange, profile=EXTENDED
+    )
+    payment_means: PaymentMeans = Field(PaymentMeans)
+    trade_tax: Container = MultiField(ApplicableTradeTax)
+    period: BillingSpecifiedPeriod = Field(
+        BillingSpecifiedPeriod, required=False, profile=BASIC
+    )
+    allowance_charge: Container = MultiField(
         TradeAllowanceCharge,
         required=False,
         profile=BASIC,
         _d="Schalter für Zu-/Abschlag",
     )
-    service_charge = MultiField(
+    service_charge: Container = MultiField(
         LogisticsServiceCharge, required=False, profile=EXTENDED
     )
-    terms = MultiField(PaymentTerms, required=False, profile=BASIC)
-    monetary_summation = Field(
+    terms: Container = MultiField(PaymentTerms, required=False, profile=BASIC)
+    monetary_summation: MonetarySummation = Field(
         MonetarySummation,
         required=True,
         profile=BASIC,
         _d="Detailinformation zu Belegsummen",
     )
-    invoice_referenced_document = Field(
+    invoice_referenced_document: InvoiceReferencedDocument = Field(
         InvoiceReferencedDocument, required=False, profile=BASIC
     )
-    accounting_account = Field(
+    accounting_account: ReceivableAccountingAccount = Field(
         ReceivableAccountingAccount,
         required=False,
         profile=BASIC,
         _d="Detailinformationen zur Buchungsreferenz",
     )
-    advance_payment = MultiField(AdvancePayment, required=False, profile=EXTENDED)
+    advance_payment: Container = MultiField(
+        AdvancePayment, required=False, profile=EXTENDED
+    )
 
     class Meta:
         namespace = NS_RAM
@@ -215,10 +232,10 @@ class Meta:
 
 
 class TradeTransaction(Element):
-    items = MultiField(LineItem, required=True)
-    agreement = Field(TradeAgreement, required=True)
-    delivery = Field(TradeDelivery, required=True)
-    settlement = Field(TradeSettlement, required=True)
+    items: Container = MultiField(LineItem, required=True)
+    agreement: TradeAgreement = Field(TradeAgreement, required=True)
+    delivery: TradeDelivery = Field(TradeDelivery, required=True)
+    settlement: TradeSettlement = Field(TradeSettlement, required=True)
 
     class Meta:
         namespace = NS_RSM
diff --git a/drafthorse/models/tradelines.py b/drafthorse/models/tradelines.py
index 9b43c9a..e399383 100644
--- a/drafthorse/models/tradelines.py
+++ b/drafthorse/models/tradelines.py
@@ -5,6 +5,7 @@
     ReceivableAccountingAccount,
     TradeAllowanceCharge,
 )
+from .container import Container
 from .delivery import SupplyChainEvent
 from .elements import Element
 from .fields import (
@@ -42,7 +43,7 @@ class GrossPrice(Element):
     basis_quantity = QuantityField(
         NS_RAM, "BasisQuantity", required=False, profile=COMFORT, _d="Preisbasismenge"
     )
-    charge = MultiField(AllowanceCharge, required=False, profile=COMFORT)
+    charge: Container = MultiField(AllowanceCharge, required=False, profile=COMFORT)
 
     class Meta:
         namespace = NS_RAM
@@ -65,7 +66,7 @@ class LineDocument(Element):
     line_id = StringField(NS_RAM, "LineID")
     line_status_code = StringField(NS_RAM, "LineStatusCode")
     line_status_reason_code = StringField(NS_RAM, "LineStatusReasonCode")
-    notes = MultiField(IncludedNote)
+    notes: Container = MultiField(IncludedNote)
 
     class Meta:
         namespace = NS_RAM
@@ -73,18 +74,20 @@ class Meta:
 
 
 class LineAgreement(Element):
-    buyer_order = Field(
+    buyer_order: LineBuyerOrderReferencedDocument = Field(
         LineBuyerOrderReferencedDocument, required=False, profile=EXTENDED
     )
-    contract = Field(LineContractReferencedDocument, required=False, profile=EXTENDED)
-    customer_order = Field(
+    contract: LineContractReferencedDocument = Field(
+        LineContractReferencedDocument, required=False, profile=EXTENDED
+    )
+    customer_order: LineUltimateCustomerOrderReferencedDocument = Field(
         LineUltimateCustomerOrderReferencedDocument, required=False, profile=EXTENDED
     )
-    additional_references = MultiField(
+    additional_references: Container = MultiField(
         LineAdditionalReferencedDocument, required=False, profile=COMFORT
     )
-    gross = Field(GrossPrice, required=False, profile=COMFORT)
-    net = Field(NetPrice)
+    gross: GrossPrice = Field(GrossPrice, required=False, profile=COMFORT)
+    net: NetPrice = Field(NetPrice)
 
     class Meta:
         namespace = NS_RAM
@@ -109,21 +112,25 @@ class LineDelivery(Element):
         profile=EXTENDED,
         _d="Anzahl Packstücke",
     )
-    ship_to = Field(ShipToTradeParty, required=False, profile=EXTENDED)
-    ultimate_ship_to = Field(UltimateShipToTradeParty, required=False, profile=EXTENDED)
-    event = Field(
+    ship_to: ShipToTradeParty = Field(
+        ShipToTradeParty, required=False, profile=EXTENDED
+    )
+    ultimate_ship_to: UltimateShipToTradeParty = Field(
+        UltimateShipToTradeParty, required=False, profile=EXTENDED
+    )
+    event: SupplyChainEvent = Field(
         SupplyChainEvent,
         required=False,
         profile=EXTENDED,
         _d="Detailinformationen zur tatsächlichen Lieferung",
     )
-    despatch_advice = Field(
+    despatch_advice: LineDespatchAdviceReferencedDocument = Field(
         LineDespatchAdviceReferencedDocument, required=False, profile=EXTENDED
     )
-    receiving_advice = Field(
+    receiving_advice: LineReceivingAdviceReferencedDocument = Field(
         LineReceivingAdviceReferencedDocument, required=False, profile=EXTENDED
     )
-    delivery_note = Field(
+    delivery_note: LineDeliveryNoteReferencedDocument = Field(
         LineDeliveryNoteReferencedDocument, required=False, profile=EXTENDED
     )
 
@@ -150,21 +157,23 @@ class Meta:
 
 
 class LineSettlement(Element):
-    trade_tax = Field(ApplicableTradeTax, required=False)
-    period = Field(BillingSpecifiedPeriod, required=False)
-    allowance_charge = MultiField(
+    trade_tax: ApplicableTradeTax = Field(ApplicableTradeTax, required=False)
+    period: BillingSpecifiedPeriod = Field(BillingSpecifiedPeriod, required=False)
+    allowance_charge: Container = MultiField(
         TradeAllowanceCharge,
         required=False,
         _d="Schalter für Zu-/Abschlag",
     )
-    monetary_summation = Field(LineSummation, required=False, profile=BASIC)
-    invoice_referenced_document = Field(
+    monetary_summation: LineSummation = Field(
+        LineSummation, required=False, profile=BASIC
+    )
+    invoice_referenced_document: InvoiceReferencedDocument = Field(
         InvoiceReferencedDocument, required=False, profile=EXTENDED
     )
-    additional_referenced_document = Field(
+    additional_referenced_document: LineAdditionalReferencedDocument = Field(
         LineAdditionalReferencedDocument, required=False, profile=COMFORT
     )
-    accounting_account = Field(
+    accounting_account: ReceivableAccountingAccount = Field(
         ReceivableAccountingAccount,
         required=False,
         profile=COMFORT,
@@ -177,11 +186,11 @@ class Meta:
 
 
 class LineItem(Element):
-    document = Field(LineDocument, required=True)
-    product = Field(TradeProduct)
-    agreement = Field(LineAgreement)
-    delivery = Field(LineDelivery)
-    settlement = Field(LineSettlement, required=True)
+    document: LineDocument = Field(LineDocument, required=True)
+    product: TradeProduct = Field(TradeProduct)
+    agreement: LineAgreement = Field(LineAgreement)
+    delivery: LineDelivery = Field(LineDelivery)
+    settlement: LineSettlement = Field(LineSettlement, required=True)
 
     class Meta:
         namespace = NS_RAM