suppose I have 10 samsung s4 in my stock with 10 different serial numnbers while generating a sale order i select samsung s4 in products there is one2many line in sale.order.line where i need to select available serial numbers(m2o field) of the particular phone now my problem is how to use domain so that selected serial numbers are not shown in list for selling eg : if i have selected serial no 1,2,3 under three lines of sale order line then in line 4 ..selected serial number should not be shown