Cancelled Purchase order lines

[chaitu_apps]

Version R12/11i? = R12
Instance PROD/TEST/VIS? =Prod
Module? = PO

Hi,

We have approved purchase order and already received some of the purchase order quantity.But user has cancelled the Purchase order lines (tools- cancel).

Is there any solution to revert back our cancelled purchase order lines, because we need to do payment , GRN for remain po quantity.

Can any one help on this please. it's veryvery urgent.

thanks in advance.