Hi Pushkaraj,
To reverse the check payment Entry there are three ways to reverse
1) FCH3 - Unused Check (in which check has been cancel / lost before posting )
2) FCH9 - Issued Check (check issued to vendor but do not presented in bank)
3) FCH8 - Cancel Paymnet ( wrong payment entry has been passed)
if still it is not working then kindly use FCHG to reset the data
Thanks
Trinath