diff --git a/ChangeLog.md b/ChangeLog.md
index 56bcd27..1daf49e 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,8 @@
 # ChangeLog
 
+## 4.1.8.0
+- Ajout d'une option pour creer la facture meme si le montant est egale a 0
+
 ## 4.1.7.0
 - Mouvement de stock à la validation d'une commande synchronisée si la synchro des stocks est paramètré dolibarr vers WooCommerce et qu'il n'y a qu'un entrepot de selectionné
 
diff --git a/admin/eCommerceSetup.php b/admin/eCommerceSetup.php
index 6b566ce..d52c34a 100644
--- a/admin/eCommerceSetup.php
+++ b/admin/eCommerceSetup.php
@@ -177,10 +177,12 @@
 				$ecommerceOrderActions['send_invoice_by_mail'] = GETPOST('ecommerce_send_invoice_by_mail', 'int') ? 1 : 0;
 				$ecommerceOrderActions['create_invoice_deposit_type'] = GETPOST('ecommerce_create_invoice_deposit_type', 'aZ09');
 				$ecommerceOrderActions['create_invoice_deposit_value'] = GETPOST('ecommerce_create_invoice_deposit_value', 'int');
+				$ecommerceOrderActions['create_invoice_if_amount_0'] = GETPOST('ecommerce_create_invoice_if_amount_0', 'int') ? 1 : 0;
                 if (empty($ecommerceOrderActions['create_invoice'])) {
 					$ecommerceOrderActions['send_invoice_by_mail'] = 0;
 					$ecommerceOrderActions['create_invoice_deposit_type'] = '';
 					$ecommerceOrderActions['create_invoice_deposit_value'] = 0;
+					$ecommerceOrderActions['create_invoice_if_amount_0'] = 0;
 				}
             }
             if ($conf->supplier_invoice->enabled && !empty($ecommerceOrderActions['create_invoice'])) {
diff --git a/admin/tpl/eCommerceSetup.tpl.php b/admin/tpl/eCommerceSetup.tpl.php
index 6b77bbd..e5d8aed 100644
--- a/admin/tpl/eCommerceSetup.tpl.php
+++ b/admin/tpl/eCommerceSetup.tpl.php
@@ -388,6 +388,8 @@ function ecommerce_update_invoice_deposit_value_text() {
 					}
 				});
 			</script>
+			<br>
+			<input type="checkbox" id="ecommerce_create_invoice_if_amount_0" name="ecommerce_create_invoice_if_amount_0" value="1" <?php print !empty($ecommerceOrderActions['create_invoice_if_amount_0']) ? ' checked' : '' ?>>&nbsp;<label for="ecommerce_create_invoice_if_amount_0"><?php print $langs->trans('ECommerceCreateInvoiceIfAmount0') ?></label>&nbsp;
 			<?php
 				}
 			}
diff --git a/class/business/eCommerceSynchro.class.php b/class/business/eCommerceSynchro.class.php
index 516bd7e..665247f 100755
--- a/class/business/eCommerceSynchro.class.php
+++ b/class/business/eCommerceSynchro.class.php
@@ -4957,7 +4957,9 @@ public function synchronizeInvoiceFromOrder($order_data, $dont_synchronize_produ
 					$this->error = $invoice->error;
 					$this->errors = array_merge($this->errors, $invoice->errors);
 					$error++;
-				} elseif (!empty($this->eCommerceSite->parameters['order_actions']['create_invoice']) && !empty($order_data['billed'])) {
+				} elseif (!empty($this->eCommerceSite->parameters['order_actions']['create_invoice']) && !empty($order_data['billed']) &&
+					(empty($this->eCommerceSite->parameters['order_actions']['create_invoice_if_amount_0']) || price2num($order_data['payment_amount_ttc']) != 0)
+				) {
 					// Check if order / invoice already synchronized
 					$this->initECommerceCommande();
 					$result = $this->eCommerceCommande->fetchByRemoteId($order_data['remote_id'], $this->eCommerceSite->id);
diff --git a/core/modules/modECommerceNg.class.php b/core/modules/modECommerceNg.class.php
index 69a987d..0ca2fc3 100644
--- a/core/modules/modECommerceNg.class.php
+++ b/core/modules/modECommerceNg.class.php
@@ -61,7 +61,7 @@ function __construct($db)
 		$this->editor_url = 'http://www.open-dsi.fr';
 
 		// Possible values for version are: 'development', 'experimental', 'dolibarr' or version
-		$this->version = '4.1.7';
+		$this->version = '4.1.8';
 		// Key used in llx_const table to save module status enabled/disabled (where MYMODULE is value of property name of module in uppercase)
 		$this->const_name = 'MAIN_MODULE_' . strtoupper($this->name);
 		// Where to store the module in setup page (0=common,1=interface,2=others,3=very specific)
diff --git a/langs/en_US/ecommerce.lang b/langs/en_US/ecommerce.lang
index c6eae8a..d4357df 100755
--- a/langs/en_US/ecommerce.lang
+++ b/langs/en_US/ecommerce.lang
@@ -297,6 +297,7 @@ ECommerceCreateInvoice                      = Create the bill
 ECommerceCreateSupplierInvoiceFromFee       = Create the supplier bill from the charges
 ECommerceSendInvoiceByMail                  = Send the bill by email
 ECommerceCreateOrderDescription             = Related actions when retrieving WooCommerce orders (Enter the payment methods associated with WooCommerce)
+ECommerceCreateInvoiceIfAmount0                                                                     =Créer la facture même si le montant est égale à 0
 
 ECommercePaymentGatewaysCorrespondence              = Correspondence of the payment methods with the site
 ECommercePaymentGatewayLabel                        = Payment method on the site
diff --git a/langs/fr_FR/ecommerce.lang b/langs/fr_FR/ecommerce.lang
index 4aa7431..22ff199 100644
--- a/langs/fr_FR/ecommerce.lang
+++ b/langs/fr_FR/ecommerce.lang
@@ -289,6 +289,7 @@ ECommerceCreateInvoice
 ECommerceCreateSupplierInvoiceFromFee                                                               =Créer la facture fournisseur à partir des frais
 ECommerceSendInvoiceByMail                                                                          =Envoyer la facture par mail
 ECommerceCreateOrderDescription                                                                     =Actions associées lors de la récupération des commandes WooCommerce (Renseigner les modes de paiements associés à WooCommerce)
+ECommerceCreateInvoiceIfAmount0                                                                     =Créer la facture même si le montant est égale à 0
 
 ECommercePaymentGatewaysCorrespondence                                                              =Correspondance des modes de paiements avec le site
 ECommercePaymentGatewayLabel                                                                        =Mode de paiement sur le site
diff --git a/syncmanual.php b/syncmanual.php
new file mode 100644
index 0000000..c4b5838
--- /dev/null
+++ b/syncmanual.php
@@ -0,0 +1,11 @@
+<?php
+
+// Change this following line to use the correct relative path (../, ../../, etc)
+$res=0;
+if (! $res && file_exists("../main.inc.php")) $res=@include '../main.inc.php';			// to work if your module directory is into a subdir of root htdocs directory
+if (! $res && file_exists("../../main.inc.php")) $res=@include '../../main.inc.php';		// to work if your module directory is into a subdir of root htdocs directory
+if (! $res) die("Include of main fails");
+
+exec('php ' . dol_buildpath('/ecommerceng/scripts/syncronize_to_dolibarr.php', 0) . ' ' . GETPOST('login', 'alphanohtml') . ' ' . GETPOST('site_id', 'int') . ' ' . GETPOST('type', 'alphanohtml') . ' ' . GETPOST('id_from', 'int') . ' ' . GETPOST('id_to', 'int') . ' >> ' . DOL_DATA_ROOT . '/manualsync.log & echo $!;');
+
+$db->close();