diff --git a/addons/purchase/purchase.py b/addons/purchase/purchase.py
index 709ce9b437f..be5a5edecda 100644
--- a/addons/purchase/purchase.py
+++ b/addons/purchase/purchase.py
@@ -488,7 +488,7 @@ class PurchaseOrderLine(models.Model):
                     qty = 0.0
                     for move in line.move_ids:
                         if move.state == 'done' and move.product_id.id == bom_line.get('product_id', False):
-                            qty += self.env['product.uom']._compute_qty_obj(move.product_uom, move.product_uom_qty, self.product_uom)
+                            qty += self.env['product.uom']._compute_qty(move.product_uom.id, move.product_uom_qty, bom_line['product_uom'])
                     if float_compare(qty, bom_line['product_qty'], precision_digits=precision) < 0:
                         bom_delivered[bom.id] = False
                         break
diff --git a/addons/sale_mrp/sale_mrp.py b/addons/sale_mrp/sale_mrp.py
index 48b22f53210..35bb2c539a8 100644
--- a/addons/sale_mrp/sale_mrp.py
+++ b/addons/sale_mrp/sale_mrp.py
@@ -48,7 +48,7 @@ class SaleOrderLine(models.Model):
                 qty = 0.0
                 for move in self.procurement_ids.mapped('move_ids'):
                     if move.state == 'done' and move.product_id.id == bom_line.get('product_id', False):
-                        qty += self.env['product.uom']._compute_qty_obj(move.product_uom, move.product_uom_qty, self.product_uom)
+                        qty += self.env['product.uom']._compute_qty(move.product_uom.id, move.product_uom_qty, bom_line['product_uom'])
                 if float_compare(qty, bom_line['product_qty'], precision_digits=precision) < 0:
                     bom_delivered[bom.id] = False
                     break