diff --git a/addons/purchase_stock/models/purchase.py b/addons/purchase_stock/models/purchase.py
index 1a3f2a8b760..4f75a40560f 100644
--- a/addons/purchase_stock/models/purchase.py
+++ b/addons/purchase_stock/models/purchase.py
@@ -368,7 +368,10 @@ class PurchaseOrderLine(models.Model):
         previous_product_qty = {line.id: line.product_uom_qty for line in lines}
         result = super(PurchaseOrderLine, self).write(values)
         if 'price_unit' in values:
-            self.move_ids.price_unit = self.price_unit
+            for line in lines:
+                # Avoid updating kit components' stock.move
+                moves = line.move_ids.filtered(lambda s: s.state not in ('cancel', 'done') and s.product_id == line.product_id)
+                moves.write({'price_unit': line.price_unit})
         if 'product_qty' in values:
             lines.with_context(previous_product_qty=previous_product_qty)._create_or_update_picking()
         return result