SAP Message U7040 - Meter reading document &1 has different billing period to MR document &2

Diagnosis
Meter reading document &V1 has a different billing periodto meter reading document &V2& although both meter readings have thesame meter reading date. The system cannot process documents from thesame day that have the different definitions SBP and JBP.
Changes may have been made to the billing period in Customizing thathave caused inconsistencies.

Procedure
Contact SAP to determine exact causes.