Diagnosis
You are using the dynamic period control.
The quantity cannot be consistently distributed because the underlyingbilling schema has been structured incorrectly.
The lowest from-date &V1& in distribution table &V3& does not match thelowest original from-date &V2& (schema step CSNO = &V4&) of all schemasteps to be considered together.
This is probably because during re-estimation for a certain periodcategory, the period whose real meter reading results were to be usedfor the re-estimation was not structured at the same time.
This is generally a period of base period category 3.

Procedure
Check your schema.
If you cannot detect any errors, contact SAP.