Diagnosis
Installation &V3& is billed using schema &V2&. This schema containsoperand &V1& in step &V4&. An access control thatrequires a key date for month-based billing isallocated to this operand. This key date must be specified in the meterreading unit of the installation, but it is not.

System Response
The installation cannot be billed.

Procedure
Enter a key date in the meter reading unit.