[FIX] purchase: action_cancel

Action_cancel must be done on each stock.picking(with state!='cancel') linked to the purchase order
like in the revision 5aeccbd.

opw:652995

addons/purchase/purchase.py

@@ -285,6 +285,8 @@ class PurchaseOrder(models.Model):
                 if inv and inv.state not in ('cancel', 'draft'):
                     raise UserError(_("Unable to cancel this purchase order.i You must first cancel related vendor bills."))
 
+            for pick in order.picking_ids.filtered(lambda r: r.state != 'cancel'):
+                pick.action_cancel()
             if not self.env.context.get('cancel_procurement'):
                 procurements = order.order_line.mapped('procurement_ids')
                 procurements.filtered(lambda r: r.state not in ('cancel', 'exception') and r.rule_id.propagate).write({'state': 'cancel'})