diff --git a/sf_manufacturing/models/mrp_production.py b/sf_manufacturing/models/mrp_production.py
index f8a22b28..433feccc 100644
--- a/sf_manufacturing/models/mrp_production.py
+++ b/sf_manufacturing/models/mrp_production.py
@@ -1574,7 +1574,7 @@ class MrpProduction(models.Model):
                     vals['picking_type_id'] = picking_type_id
                 vals['name'] = self.env['stock.picking.type'].browse(picking_type_id).sequence_id.next_by_id()
             product_id = self.env['product.product'].browse(vals['product_id'])
-            is_self_process = product_id.materials_type_id and product_id.materials_type_id.gain_way and product_id.materials_type_id.gain_way != '自加工'
+            is_self_process = product_id.materials_type_id.gain_way if product_id.materials_type_id else None
             is_customer_provided = product_id.is_customer_provided
             key = f"{is_self_process}_{is_customer_provided}"
             if not is_custemer_group_id.get(key):