Diagnosis
You have changed the meter reading unit for installation &V1& on &V2&.You have arranged a period-end billing for this installation. Thecurrent period-end billing period begins on &v3&.
You may not change the meter reading unit during the current period-endbilling period.

Procedure
If you want to change the meter reading unit, you may do this at thebeginning of the next period-end billing period.
You can end the period-end billing period early by carrying out a finalbilling.