Check Numbers different in Bank & SAP

Hi All

Our SAP & bank check nos are not matching & hence needs to be corrected. For Example- SAP check No- 12345 has 20 USD amount, Bank Check No-12345 is 10 USD but Bank Check No- 45678 is 20 USD which should be actually in SAP too.

How can this be corrected i.e. in above example SAP Check No 12345 to be replaced with 45678? I tried with Tcodes- FCH9 (Voiding)- FCHG (Reset Void)- FCH5 (Manually Assign Check Number) but it is not allowing me to do so at FCH5 (Manually Assign Check No).

It may be noted that the check nos to be manually assigned are being assigned somewhere else hence will need to be voided to be correctly assigned. Also these checks are already cashed in by vendors.

Thanks

Pankaj