IT 14 wage type not working for retro

Hi experts,

I have following situation with a Deduction and earnings wage type for IT14 with %

On 2014.02.01 both wage types changed from 2 % to 4 %

On Feb. 15th Payroll entered a retro pay change effective 2014.02.14

Now the issue is when we run pay for Feb. 15th pay period.

My technical wage type has the correct prorated amount with base pay change but IT14 wage type amount are calculated based on current 4% instead of using 2% for first part of it.

Any ideas to help solve this will be appreciated.

This is what my PCR looks like:

Z257 Calculate Savings Plan Basic Company Contribution

   3

     2056

       AMT=  /166 Set

       RESET *    Set time period ID

       MULTI ANA  Multipl.amt/no/rate

       AMT/100    Division

       ADDWTE*    RT   Results table

     3756

       AMT=  /166 Set

       RESET *    Set time period ID

       MULTI ANA  Multipl.amt/no/rate

       AMT/100    Division

       ADDWTE*    RT   Results table