It is not possible to maintain and display the special period settings

What causes this issue?

According the central settings for posting (TFK000C), the use of special
periods is not active.

System Response

You cannot display special periods and you cannot enter them.

How to fix this error?

If you want to work with special periods, activate this in the central
settings for posting.

Procedure for System Administrators

INCLUDE FICA_NA_CUST_1 OBJECT DOKU ID TX

Error message extract from SAP system. Copyright SAP SE.