Set new value as a default value while creating PD(Performance Dailog) Form

Hi,

In Performance management,

While clicking on the Create new PD Form Button, We are getting one Pop up window with the deafult selection screen.

In that,

We are getting Valid From: and Valid To value bydefault as a '01.01.2011' and '31.12.2011' .

We need to change that value. How can we set our new value as a default value.

We checked in debugging, this values are hardcoded in the SAP standard dyanpro component.

how can we set our new default value?

Please suggest.

Thanks in advance.

Monika