Diagnosis
Billing schema &v2& contains the steps of rate &v1&. However, the orderof the steps was not identical in the rate and the billing schema. Thisis usually due to the fact that the rate was subsequently changed.
The function you chose resorted the schema steps that belong to rateV1. the order of the steps has been adjusted to the order of the ratesteps.

Procedure
Check the order of the schema steps that belong to rate &v1&.
Make manual changes to the order of the steps as necessary.