Diagnosis
You changed the meter reading unit from &v1& to &v2& for the contract.You made this change within a backbilling period. However, you are notpermitted to change the meter reading unit within a backbilling period.

Procedure
Ensure that the meter reading unit does not change within thebackbilling period. The current backbilling period started on &v3&. Ifyou wish to allocate the contract to a different meter reading unit, y
ou can do this after the end of the backbilling period.