Adding an extra screen field in CJ88

Hi,

The FICO consultant wants to know whether we can add an extra screen field in CJ88.He wants to add the posting year.Currently there is facility to add posting period and the posting year will be same as the fiscal.He wants to change the posting year.Due to this he wants to add an extra screen field - posting year so that the user can change it during reversal.

If yes then how it is bo done.

If not, is it possible to copy the entire CJ88 code and make zprogram and ztcode and add this extra field.

Please let me know your suggestion.

Thanks,

Rajani