Error reading Customizing

What causes this issue?

An error occurred when accessing the Customizing for the model
calculation.

System Response

The system cannot successfully execute the relevant function.

How to fix this error?

Contact the system administrator, who can make the required settings in
Customizing.

Procedure for System Administrators

The error occurs when accessing the Customizing table /PM0/ALUAMODTX.
To do this, work in the Implementation Guide (IMG) for Policy Management
under Policy Management -> In-Force Business Management -> Life LoB ->
Model Calculation -> <DS:SIMG./PM0/ALU_PMODTX>Assign Activity IDs to
Business Transaction, Event Type and Cause</>.

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

Error message extract from SAP system. Copyright SAP SE.