Maximum value is already reached

What causes this issue?

The largest possible entry value has been reached.
Counting begins at 'A0 0' (smallest possible entry value) and continues
with 'A0 1', 'A0 9', 'A0 A', 'A0 Z', 'A1 0' up to 'ZZ Z' (largest
possible entry value).

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Return to the main menu of the transaction and enter a new system log
number.

Error message extract from SAP system. Copyright SAP SE.