From 62f12861f102782dda1dd9638617c831373446e9 Mon Sep 17 00:00:00 2001
From: Navin-S-R <navin@aerele.in>
Date: Thu, 12 Sep 2024 15:25:54 +0530
Subject: [PATCH] fix: delete exchange gain loss journal entry while deleting
 payment entry

(cherry picked from commit 9886cf0d46f68caec45467d5dbcd018084a65088)
---
 erpnext/accounts/utils.py                  | 98 +++++++++++++++-------
 erpnext/controllers/accounts_controller.py |  5 ++
 2 files changed, 71 insertions(+), 32 deletions(-)

diff --git a/erpnext/accounts/utils.py b/erpnext/accounts/utils.py
index b2c4d92a6af9..10f30512c0b6 100644
--- a/erpnext/accounts/utils.py
+++ b/erpnext/accounts/utils.py
@@ -703,40 +703,74 @@ def cancel_exchange_gain_loss_journal(
 	Cancel Exchange Gain/Loss for Sales/Purchase Invoice, if they have any.
 	"""
 	if parent_doc.doctype in ["Sales Invoice", "Purchase Invoice", "Payment Entry", "Journal Entry"]:
-		journals = frappe.db.get_all(
-			"Journal Entry Account",
-			filters={
-				"reference_type": parent_doc.doctype,
-				"reference_name": parent_doc.name,
-				"docstatus": 1,
-			},
-			fields=["parent"],
-			as_list=1,
+		gain_loss_journals = get_linked_exchange_gain_loss_journal(
+			referenced_dt=parent_doc.doctype, referenced_dn=parent_doc.name, je_docstatus=1
 		)
-
-		if journals:
-			gain_loss_journals = frappe.db.get_all(
-				"Journal Entry",
-				filters={
-					"name": ["in", [x[0] for x in journals]],
-					"voucher_type": "Exchange Gain Or Loss",
-					"docstatus": 1,
-				},
-				as_list=1,
-			)
-			for doc in gain_loss_journals:
-				gain_loss_je = frappe.get_doc("Journal Entry", doc[0])
-				if referenced_dt and referenced_dn:
-					references = [(x.reference_type, x.reference_name) for x in gain_loss_je.accounts]
-					if (
-						len(references) == 2
-						and (referenced_dt, referenced_dn) in references
-						and (parent_doc.doctype, parent_doc.name) in references
-					):
-						# only cancel JE generated against parent_doc and referenced_dn
-						gain_loss_je.cancel()
-				else:
+		for doc in gain_loss_journals:
+			gain_loss_je = frappe.get_doc("Journal Entry", doc)
+			if referenced_dt and referenced_dn:
+				references = [(x.reference_type, x.reference_name) for x in gain_loss_je.accounts]
+				if (
+					len(references) == 2
+					and (referenced_dt, referenced_dn) in references
+					and (parent_doc.doctype, parent_doc.name) in references
+				):
+					# only cancel JE generated against parent_doc and referenced_dn
 					gain_loss_je.cancel()
+			else:
+				gain_loss_je.cancel()
+
+
+def delete_exchange_gain_loss_journal(
+	parent_doc: dict | object, referenced_dt: str | None = None, referenced_dn: str | None = None
+) -> None:
+	"""
+	Delete Exchange Gain/Loss for Sales/Purchase Invoice, if they have any.
+	"""
+	if parent_doc.doctype in ["Sales Invoice", "Purchase Invoice", "Payment Entry", "Journal Entry"]:
+		gain_loss_journals = get_linked_exchange_gain_loss_journal(
+			referenced_dt=parent_doc.doctype, referenced_dn=parent_doc.name, je_docstatus=2
+		)
+		for doc in gain_loss_journals:
+			gain_loss_je = frappe.get_doc("Journal Entry", doc)
+			if referenced_dt and referenced_dn:
+				references = [(x.reference_type, x.reference_name) for x in gain_loss_je.accounts]
+				if (
+					len(references) == 2
+					and (referenced_dt, referenced_dn) in references
+					and (parent_doc.doctype, parent_doc.name) in references
+				):
+					# only delete JE generated against parent_doc and referenced_dn
+					gain_loss_je.delete()
+			else:
+				gain_loss_je.delete()
+
+
+def get_linked_exchange_gain_loss_journal(referenced_dt: str, referenced_dn: str, je_docstatus: int) -> list:
+	"""
+	Get all the linked exchange gain/loss journal entries for a given document.
+	"""
+	gain_loss_journals = []
+	if journals := frappe.db.get_all(
+		"Journal Entry Account",
+		{
+			"reference_type": referenced_dt,
+			"reference_name": referenced_dn,
+			"docstatus": je_docstatus,
+		},
+		pluck="parent",
+	):
+		gain_loss_journals = frappe.db.get_all(
+			"Journal Entry",
+			{
+				"name": ["in", journals],
+				"voucher_type": "Exchange Gain Or Loss",
+				"is_system_generated": 1,
+				"docstatus": je_docstatus,
+			},
+			pluck="name",
+		)
+	return gain_loss_journals
 
 
 def cancel_common_party_journal(self):
diff --git a/erpnext/controllers/accounts_controller.py b/erpnext/controllers/accounts_controller.py
index a8a790719bff..ab7ee7731582 100644
--- a/erpnext/controllers/accounts_controller.py
+++ b/erpnext/controllers/accounts_controller.py
@@ -326,11 +326,16 @@ def _remove_references_in_repost_doctypes(self):
 					repost_doc.save(ignore_permissions=True)
 
 	def on_trash(self):
+		from erpnext.accounts.utils import delete_exchange_gain_loss_journal
+
 		self._remove_references_in_repost_doctypes()
 		self._remove_references_in_unreconcile()
 
 		# delete sl and gl entries on deletion of transaction
 		if frappe.db.get_single_value("Accounts Settings", "delete_linked_ledger_entries"):
+			# delete linked exchange gain/loss journal
+			delete_exchange_gain_loss_journal(self)
+
 			ple = frappe.qb.DocType("Payment Ledger Entry")
 			frappe.qb.from_(ple).delete().where(
 				(ple.voucher_type == self.doctype) & (ple.voucher_no == self.name)