is it possible to split done stock move in odoo version 9?

for example,

one stock move there state is done and quantity is 2 and now i have required both quantity in different stock move.

i try using copy stock move with 1 quantity of old stock move and old stock move write() with remaining quantity but it is give me warning like  " Quantities, Units of Measure, Products and Locations cannot be modified on stock moves that have already been processed ".

Thanks.