Dear Mohan,
It is possible,
1. FI team has to reverse/correction the postings for May.
2. After that, you need to reverse the postings from HR side.
3. Complete the process of T558B & T558C for April.
4. Rerun complete April payroll process and posting to FI
5. Rerun May payroll and posting to FI
Steps 3,4, can be tedious and time consuming. Gurus pls advise if you have better options...
Regards
Sadashiv