Moifying values in PA30 through exit/BADI

Hi experts,

I have a requiremnt whrein when the user enters a value for wagetype in PA30 for infotypes 0008, 0015, 0759 and hits the enter key or saves the data, the value should get rounded off based on some custom logic.

Can you tell me any exit/BADI where I can implment this?

I tried to used BADI: HRPAD00INFTY but did not get the updated value on the screen.

Waiting for your replies.

regards

Ashwini