Catch BuildItem errors in clean()

InvenTree/build/models.py

@@ -147,15 +147,25 @@ class BuildItem(models.Model):
         The following checks are performed:
 
         - StockItem.part must be in the BOM of the Part object referenced by Build
+        - Allocation quantity cannot exceed available quantity
         """
         
-        if self.stock_item.part not in self.build.part.required_parts():
+        super(BuildItem, self).clean()
-            print('stock_item:', self.stock_item.part)
+
-            for p in self.build.part.bom_items.all():
+        errors = {}
-                print('bom_part:', p)
+
-            raise ValidationError(
+        if self.stock_item is not None and self.stock_item.part is not None:
-                {'stock_item': _("Selected stock item not found in BOM for part '{p}'".format(p=str(self.build.part)))}
+            if self.stock_item.part not in self.build.part.required_parts():
-            )
+                errors['stock_item'] = _("Selected stock item not found in BOM for part '{p}'".format(p=str(self.build.part)))
+            
+        if self.stock_item is not None and self.quantity > self.stock_item.quantity:
+            errors['quantity'] = _("Allocated quantity ({n}) must not exceed available quantity ({q})".format(
+                n=self.quantity,
+                q=self.stock_item.quantity
+            ))
+
+        if len(errors) > 0:
+            raise ValidationError(errors)
 
     build = models.ForeignKey(
         Build,