Shift split is only allowed for period "shift"

What causes this issue?

You chose the function "shift split" for a period that is longer than
the period "shift" (day, week or month).
However, the function "shift split" is only possible for the period
"shift".

System Response

The system does not carry out the shift split.

How to fix this error?

Please only select shift periods.

Error message extract from SAP system. Copyright SAP SE.