Diagnosis
You changed the portion from &v1& to &v2& for the contract. You madethis change within a backbilling period. However, you are not permittedto change the portion within a backbilling period.

Procedure
Ensure that the portion does not change within the backbilling period.The current backbilling period started on &v3&. If you wish to allocatethe contract to a different portion, you can do this after the end ofthe backbilling period.