How can I extend the validity of already accrued Absence Quotas ?

Hi

My Client wants to extend the validity of an existing quota which is already accrued .

The Absene Quota was for year 2009 , with validity of 60 months i.e. available for deduction till year 2013.

The quota was arrrued to all employees though RPTQTA00 report , and employees already have IT2006 and various IT2001 leaves which have already been deduted from this quota.

Now the client wants that this Quota should be available to employees for deduction till year 2014 ( extending the validity by 1 more year.)

Can you please suggest any SAP Standard way (Any report / FM/ program ) that may be available for such a change?

OR

What could be the ABAP solution for this?

Seeking an Urgent help!

Sarika