purchase_usability: remove unnecessary field delivery_partner_id

purchase_stock_usability/models/purchase.py

@@ -10,17 +10,3 @@ class PurchaseOrder(models.Model):
 
     picking_type_id = fields.Many2one(tracking=True)
     incoterm_id = fields.Many2one(tracking=True)
-
-    # inherit compute method of the field delivery_partner_id
-    # defined in purchase_usability
-    @api.depends('dest_address_id', 'picking_type_id')
-    def _compute_delivery_partner_id(self):
-        for o in self:
-            delivery_partner_id = False
-            if o.dest_address_id:
-                delivery_partner_id = o.dest_address_id
-            elif (
-                    o.picking_type_id.warehouse_id and
-                    o.picking_type_id.warehouse_id.partner_id):
-                delivery_partner_id = o.picking_type_id.warehouse_id.partner_id
-            o.delivery_partner_id = delivery_partner_id

purchase_usability/models/purchase_order.py

@@ -14,15 +14,6 @@ class PurchaseOrder(models.Model):
     payment_term_id = fields.Many2one(tracking=True)
     fiscal_position_id = fields.Many2one(tracking=True)
     partner_ref = fields.Char(tracking=True)
-    # the field 'delivery_partner_id' is used in report
-    # the compute method of that field is inherited in purchase_stock_usability
-    delivery_partner_id = fields.Many2one(
-        'res.partner', compute='_compute_delivery_partner_id')
-
-    @api.depends('dest_address_id')
-    def _compute_delivery_partner_id(self):
-        for order in self:
-            order.delivery_partner_id = order.dest_address_id
 
     def print_order(self):
         report = self.env.ref('purchase.action_report_purchase_order')