SAP Message >3560 - Incorrect check digit determination for contract account numbers

Diagnosis
The contract account number &V1& determined from a number range wasextended by check digits in a way that is not permitted. You can onlydelete one or two leading zeros if you simultaneously add one or twocheck digits.
Number &V1& was changed to &V2&. This does not comply with the aboverule. The defective processing was carried out using function moduleV3.

System Response
Error message, the contract account was not saved.
INCLUDE NA_SYSADMIN1 OBJECT DOKU ID TX

Procedure for System Administration
INCLUDE FICA_NA_OSS OBJECT DOKU ID TX