An error occurred whilst processing the notification

What causes this issue?

When the notification is created or changed, an error occurs which
should not.

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?

INCLUDE NA_SYSTVERW1
IF &[SWITCH]S4H_DOCU_ON_PREMISE& = 'X'.


Procedure for System Administrator
Check your settings in Customizing.
ENDIF.

Error message extract from SAP system. Copyright SAP SE.