Diagnosis
You have changed entries in a portion that is used in one or more meterreading units. This may lead to inconsistent datasets between theportion and the meter reading units.

Example:
Originally, no combination of billing class and division categorywas entered in the appropriate field in the portion. This means thatall combinations are permitted in the meter reading unit. If acombination is now entered in the portion, it cannot exist in the meterreading unit.

Procedure
To determine which meter reading units the portion is used in, chooseWhere-used. In the meter reading units, you can adjust thecurrent status of the portion by choosing Edit -> Activateportion.