Shipment Attachments

Create shipment attachments on parent order.

src/backend/InvenTree/order/models.py

@@ -1738,6 +1738,7 @@ def is_completed(self):
 
 
 class SalesOrderShipment(
+    InvenTree.models.InvenTreeAttachmentMixin,
     InvenTree.models.InvenTreeNotesMixin,
     report.mixins.InvenTreeReportMixin,
     InvenTree.models.MetadataMixin,
@@ -1921,6 +1922,13 @@ def complete_shipment(self, user, **kwargs):
 
         trigger_event('salesordershipment.completed', id=self.pk)
 
+    def create_attachment(self, *args, **kwargs):
+        """Create an attachment / link on parent order.
+
+        This will only be called when a generated report should be attached to this instance.
+        """
+        return self.order.create_attachment(*args, **kwargs)
+
 
 class SalesOrderExtraLine(OrderExtraLine):
     """Model for a single ExtraLine in a SalesOrder.