diff --git a/addons/mrp/models/mrp_production.py b/addons/mrp/models/mrp_production.py
index ad776b6cfb0..2962fbd4fa2 100644
--- a/addons/mrp/models/mrp_production.py
+++ b/addons/mrp/models/mrp_production.py
@@ -816,11 +816,13 @@ class MrpProduction(models.Model):
             moves_to_do = order.move_raw_ids.filtered(lambda x: x.state not in ('done', 'cancel'))
             for move in moves_to_do.filtered(lambda m: m.product_qty == 0.0 and m.quantity_done > 0):
                 move.product_uom_qty = move.quantity_done
-            moves_to_do._action_done()
+            # MRP do not merge move, catch the result of _action_done in order
+            # to get extra moves.
+            moves_to_do = moves_to_do._action_done()
             moves_to_do = order.move_raw_ids.filtered(lambda x: x.state == 'done') - moves_not_to_do
             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._action_done()
+            moves_to_finish = moves_to_finish._action_done()
             order.action_assign()
             consume_move_lines = moves_to_do.mapped('move_line_ids')
             for moveline in moves_to_finish.mapped('move_line_ids'):