diff --git a/services/operation_services.py b/services/operation_services.py
index e57d2ef667e39af0227591f2a816c973ca030b86..1fe452de26e4b1e399137ca05e685fef83fbabe4 100644
--- a/services/operation_services.py
+++ b/services/operation_services.py
@@ -212,8 +212,31 @@ class OperationsService(Component):
                 if acc_account_ids
                 else []
             )
+
+            # Récupération de toutes les factures externes
+            # liées à l'opération spécifiée
+            domain = [("acc_operation_id", "=", _id)]
+
+            domain += [
+                ("type", "=", "facture"),
+            ]
+            acc_contract_ids = self.env["acc.contract"].search(domain)
+            datas["factures_externes"] = (
+                acc_contract_ids.mapped(
+                    lambda n: {
+                        "id": n.id,
+                        "name": n.name,
+                        "start_date": n.start_date,
+                        "end_date": n.end_date,
+                        "type": n.type,
+                        "url": base_url + n.get_portal_url(),
+                    }
+                )
+                if acc_contract_ids
+                else []
+            )
         else:
-            # Récupération de toutes les factures liées à l'opération spécifiée
+            # Récupération de tous les contrats liés à l'opération spécifiée
             domain = [("acc_operation_id", "=", _id)]
             domain_pmo = [("acc_operation_id", "=", _id)]
             role = self._get_role(operation)
@@ -707,6 +730,21 @@ class OperationsService(Component):
                     },
                 },
             },
+            "factures_externes": {
+                "nullable": True,
+                "type": "list",
+                "schema": {
+                    "type": "dict",
+                    "schema": {
+                        "id": {"type": "integer"},
+                        "name": {"type": "string"},
+                        "type": {"type": "string", "nullable": True},
+                        "url": {"type": "string", "nullable": True},
+                        "seller": {"type": "string", "nullable": True},
+                        "buyer": {"type": "string", "nullable": True},
+                    },
+                },
+            },
             "contracts": {
                 "nullable": True,
                 "type": "list",