Diagnosis
You changed the meter reading unit for installation &V1& on &V2&. Youhave arranged a backbilling for this installation. The currentbackbilling period begins on &v3&.
You may not change the meter reading unit during the currentbackbilling period.

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