I have a one2many field in product form to keep unique serial numbers of the product. All serial numbers are linked to a location. This location can belong to any warehouse and can be at nth number in hierarchy.

While creating a sale order , after selecting product in sale order line. I need to select available serial numbers of the selected product in sale order sub line. Here I need a domain such a way that only serial number should be shown in sale order sub line which exist in the selected shop's warehouse.

I need to apply domain on 'unique_code' in 'sale_granite_line' class class structure is given below.

How to return domain on the same? Any help would be appreciated. Thank You.

class sale_order_line(osv.osv):

_inherit="sale.order.line"

_columns={
          'sub_order_lines':fields.one2many('sale.granite.line','sale_line_id','Size'),
          }

class sale_granite_line(osv.osv):

_name='sale.granite.line'

_columns={
          'sale_line_id':fields.many2one('sale.order.line'),
          'unique_code':fields.many2one('product.serial.lines','Code',required=True),
          }

class product_product(osv.osv):

_inherit="product.product"

_columns={
          'product_serial_lines':fields.one2many('product.serial.lines','product_id','Product Serial Lines'),
          }

class product_serial_lines(osv.osv):

_name='product.serial.lines'

_columns={
          'name':fields.char('Serial No'),
          'product_id':fields.many2one('product.product','Product',ondelete="cascade"),
          'product_location':fields.many2one('stock.location','Location',required=True,ondelete="cascade"),
          }