SAP Message AH856 - Update to deletion variant: overwriting of values is not permitted

Diagnosis
You are updating an amount in schema step &v1& with variant &v2& toschema step &v3& with variant &v4&. In the rate, you have specified forvariant &v2& that the values in the target step are to be overwritten(not added to). This is not permitted since variant &v4& is a deletionvariant.
Deletion variants can only compare the amount and delete thecorresponding billing line items correctly if an "adding" update isperformed.

System Response
Billing is terminated.

Procedure
Correct the rate structure.