Diagnosis
The data in the Estim. in Bill. field of meter reading unit &v1&does not match rate category &v2& of the installation. This may havebeen caused by the following:

• If the installation is not billed with dynamic period control, you may
not enter a meter reading unit that has meter reading dates to beestimated in billing.

• If the installation is billed with dynamic period control, the content
of field Dyn.per.control of the rate category in table Basiccategories for dynamic period control must be allocated to asuitable basic category:
If it has been defined in the meter reading unit that billing is toestimate the results for meter reading dates, you must enter a value inthe rate category in the Dyn.per.control field. This value mustpoint towards basic category estimation of meter reading results inbilling.
If on the other hand the value entered in the rate category pointstowards basic category determination of current periods via meterreading results, the Estim. in Bill. field may be left blankfor meter reading dates in the meter reading unit that is allocated tothe rate category in the installation.

Procedure
Choose a meter reading unit that is suitable for the rate category.