diff --git a/addons/mrp/models/mrp_workorder.py b/addons/mrp/models/mrp_workorder.py
index 4900076f3a3..8f8945213d9 100644
--- a/addons/mrp/models/mrp_workorder.py
+++ b/addons/mrp/models/mrp_workorder.py
@@ -63,7 +63,7 @@ class MrpWorkorder(models.Model):
         ('done', 'Finished'),
         ('cancel', 'Cancelled')], string='Status',
         compute='_compute_state', store=True,
-        default='pending', copy=False, readonly=True, recursive=True)
+        default='pending', copy=False, readonly=True, recursive=True, index=True)
     leave_id = fields.Many2one(
         'resource.calendar.leaves',
         help='Slot into workcenter calendar once planned',
diff --git a/addons/purchase_stock/models/product.py b/addons/purchase_stock/models/product.py
index 55b055333eb..f93667c834d 100644
--- a/addons/purchase_stock/models/product.py
+++ b/addons/purchase_stock/models/product.py
@@ -33,7 +33,7 @@ class ProductProduct(models.Model):
 
         qty_by_product_location, qty_by_product_wh = super()._get_quantity_in_progress(location_ids, warehouse_ids)
         domain = self._get_lines_domain(location_ids, warehouse_ids)
-        groups = self.env['purchase.order.line'].read_group(domain,
+        groups = self.env['purchase.order.line']._read_group(domain,
             ['product_id', 'product_qty', 'order_id', 'product_uom', 'orderpoint_id'],
             ['order_id', 'product_id', 'product_uom', 'orderpoint_id'], lazy=False)
         for group in groups: