# External ID mapping deduction and KOM

* adds support for external id usage on deduction creation for both ecoaccount and intervention
* adds support for external id usage on compensation's intervention reference

api/utils/serializer/v1/deduction.py

@@ -62,6 +62,14 @@ class DeductionAPISerializerV1(AbstractModelAPISerializerV1,
         if surface <= 0:
             raise ValueError("Surface must be > 0 m²")
 
+        # Check if external identifiers need to be mapped onto internal ones
+        acc_ext_id = self._get_external_identifier(acc_id)
+        intervention_ext_id = self._get_external_identifier(intervention_id)
+        if acc_ext_id:
+            acc_id = acc_ext_id.internal_id
+        if intervention_ext_id:
+            intervention_id = intervention_ext_id.internal_id
+
         acc = EcoAccount.objects.get(
             id=acc_id,
             deleted__isnull=True,