Custom exit variable for fiscal year/period

Hi BI Experts

1) In one of the column i just want Budget data to be displayed for the entire year..i.e even if the user enters 005/2006 for fiscal year /period that column should display 001/2006 to 012/2006 Budget.

I have created a restricted KF for 0AMOUNT restricted by version(for Budget), valuetype (for Budget )

now how do I assign variable for Fiscal year/period...and the problem is posting period is not populated ...I mean there is no transformation for that...

Can you share your experience on that ...full points wil be awarded...

Thanks