There may not be more than 199 fiscal year variants

What causes this issue?

The values for the fiscal year variants are converted into an internal
integer value, the master data ID (SID). This SID may not be greater
than 199 for the fiscal year variant.
The value can be exceeded when either more than 199 entries are in table
T009 or if there are omissions in the number assignment.

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?

If you have more than 199 fiscal year variants, you should determine how
many of them you actually use and delete the rest.
Check the status of the number range responsible for the SID assignment
of 0FISCVARNT. To do this, in InfoObject maintenance for 0FISCVARNT,
choose <LS>Extras</> <LS>-> Number Range Object -> For SIDs</>.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.