diff --git a/addons/mrp/models/stock_rule.py b/addons/mrp/models/stock_rule.py
index 1a608d5af48..bb0f38cc81c 100644
--- a/addons/mrp/models/stock_rule.py
+++ b/addons/mrp/models/stock_rule.py
@@ -198,7 +198,7 @@ class StockRule(models.Model):
         if not manufacture_rule:
             return delay, delay_description
         manufacture_rule.ensure_one()
-        bom = (product.variant_bom_ids or product.bom_ids)[:1]
+        bom = values.get('bom') or (product.variant_bom_ids or product.bom_ids)[:1]
         manufacture_delay = bom.produce_delay
         delay += manufacture_delay
         if not bypass_delay_description: