Rate category change is only possible after meter reading on database

What causes this issue?

On &v1& you changed from rate category &v2& (that bills with dynamic
period control from basic category <ZH>estimation of meter reading
results in billing</>) to rate category &v3&. There must be meter
reading results in the database for the new rate category at the start
and end of the billing period. However, no meter reading results exist
in the database for the last billing order with rate category &v2&.

System Response

Processing is canceled.

How to fix this error?

Enter meter reading results for the last billing order before the rate
change.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.