You cannot enter a billing factor

What causes this issue?

You tried to enter a billing factor. You can only do this when the
measuring type of the device is indirect, semi-indirect, or
indirect/semi-indirect.

System Response

INCLUDE ISU_VERARB OBJECT DOKU ID TX

How to fix this error?

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.