modules/purchase/purchase.py

@@ -1224,6 +1224,7 @@ class Line(sequence_ordered(), ModelSQL, ModelView):
             If(Eval('type') != 'line',
                 ('id', '=', None),
                 ()),
+            ('type','=','goods')
             ],
         states={
             'invisible': Eval('type') != 'line',