Proration dates exist for conditional rate that cannot be split

What causes this issue?

A TOU exception is billed for TOU exception program &v1&. This defines
that <DS:DE.E_TOUEP_EXC_SPLITTABLE>TOU exceptions cannot be split</>.
Conditional rate &v2& has a proration date on &v3&.

System Response

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

INCLUDE ISU_VERARB OBJECT DOKU ID TX

How to fix this error?

You can resolve this error as follows:
If it is necessary to split the periods for the TOU exception, change
the definition of the TOU exception program.
If you cannot prevent the proration, exclude the TOU exception for the
contract from billing by entering a TOU exception response with the <LS>
Opt-Out</> category.
Attempt to move the proration by specifying the proration reason &v4&.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.