Diagnosis
If you enter an alternative portion in the contract, the system doesnot check if this portion has the same length as theoriginal portion:&V4&. The original portion &V4& isspecified in meter reading unit &V1& in installation &V2&.

Procedure
Compare the period length of the alternative portion with that of theoriginal portion &V4&.
If you still wish to use the alternative portion even though the twoportions have different lengths, you must change the allocation of themeter reading unit in installation &V2&. The period lengths of themeter reading unit and the alternative portion must be the same.