'sequence': fields.integer('Sequence', help="Gives the sequence order when displaying a list of sales order lines."),
'product_id': fields.many2one('product.product', 'Product', domain=[('sale_ok', '=', True)], change_default=True),
'invoice_lines': fields.many2many('account.invoice.line', 'sale_order_line_invoice_rel', 'order_line_id', 'invoice_id', 'Invoice Lines', readonly=True),
'sequence': fields.integer('Sequence', help="Gives the sequence order when displaying a list of sales order lines."),
'product_id': fields.many2one('product.product', 'Product', domain=[('sale_ok', '=', True)], change_default=True),
'invoice_lines': fields.many2many('account.invoice.line', 'sale_order_line_invoice_rel', 'order_line_id', 'invoice_id', 'Invoice Lines', readonly=True),