Allocation search by IPN (#9944)

* Fix for "has_ipn" filter

* Enable filtering and sorting by IPN in SalesOrderAllocation table

* Bump API version

src/backend/InvenTree/InvenTree/api_version.py

@@ -1,12 +1,16 @@
 """InvenTree API version information."""
 
 # InvenTree API version
-INVENTREE_API_VERSION = 360
+INVENTREE_API_VERSION = 361
 
 """Increment this API version number whenever there is a significant change to the API that any clients need to know about."""
 
 INVENTREE_API_TEXT = """
 
+v361 -> 2025-07-03 : https://github.com/inventree/InvenTree/pull/9944
+    - Enable SalesOrderAllocation list to be filtered by part IPN value
+    - Enable SalesOrderAllocation list to be ordered by part MPN value
+
 v360 -> 2025-07-02 : https://github.com/inventree/InvenTree/pull/9937
     - Provide more detailed StockItem information in the BuildItem serializer
     - Provide more detailed StockItem information in the SalesOrderAllocation serializer

src/backend/InvenTree/order/api.py

@@ -1217,6 +1217,7 @@ class SalesOrderAllocationList(SalesOrderAllocationMixin, BulkUpdateMixin, ListA
         'quantity',
         'part',
         'serial',
+        'IPN',
         'batch',
         'location',
         'order',
@@ -1224,6 +1225,7 @@ class SalesOrderAllocationList(SalesOrderAllocationMixin, BulkUpdateMixin, ListA
     ]
 
     ordering_field_aliases = {
+        'IPN': 'item__part__IPN',
         'part': 'item__part__name',
         'serial': ['item__serial_int', 'item__serial'],
         'batch': 'item__batch',
@@ -1232,7 +1234,12 @@ class SalesOrderAllocationList(SalesOrderAllocationMixin, BulkUpdateMixin, ListA
         'shipment_date': 'shipment__shipment_date',
     }
 
-    search_fields = {'item__part__name', 'item__serial', 'item__batch'}
+    search_fields = {
+        'item__part__name',
+        'item__part__IPN',
+        'item__serial',
+        'item__batch',
+    }
 
     def get_serializer(self, *args, **kwargs):
         """Return the serializer instance for this endpoint.

src/backend/InvenTree/part/api.py

@@ -716,8 +716,8 @@ class PartFilter(rest_filters.FilterSet):
     def filter_has_ipn(self, queryset, name, value):
         """Filter by whether the Part has an IPN (internal part number) or not."""
         if str2bool(value):
-            return queryset.exclude(IPN='')
-        return queryset.filter(IPN='')
+            return queryset.exclude(IPN='').exclude(IPN=None)
+        return queryset.filter(Q(IPN='') | Q(IPN=None)).distinct()
 
     # Regex filter for name
     name_regex = rest_filters.CharFilter(