functionId &1 specified several times

What causes this issue?

In the array @Consumption.ranking.activeFunctions, function &V1& is
specified several times. This does not make any sense, and besides,
there could be contradicting weight-settings.

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?

Remove the duplicate function ids.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.