diff --git a/addons/mrp/models/mrp_production.py b/addons/mrp/models/mrp_production.py
index e8bdc1677a5..12002b3b25a 100644
--- a/addons/mrp/models/mrp_production.py
+++ b/addons/mrp/models/mrp_production.py
@@ -823,6 +823,8 @@ class MrpProduction(models.Model):
             order._cal_price(moves_to_do)
             moves_to_finish = order.move_finished_ids.filtered(lambda x: x.state not in ('done', 'cancel'))
             moves_to_finish = moves_to_finish._action_done()
+            order.workorder_ids.mapped('raw_workorder_line_ids').unlink()
+            order.workorder_ids.mapped('finished_workorder_line_ids').unlink()
             order.action_assign()
             consume_move_lines = moves_to_do.mapped('move_line_ids')
             for moveline in moves_to_finish.mapped('move_line_ids'):