G/L Account Blocked and Return to vendor should be done

hi all

i have a scenario where i need some solution.

two years before user created a PO with some G/L account and one year before that GL account is blocked for posting and now the user wants to do 122 movement type returns to vendor..

is there any option where we can change the g/l account while doing or any other options?

regards

Ganeshkumar