Only enter averaging type/avg from/fixed temp.if thermal gas billing = 00

What causes this issue?

In most cases, you maintain the following fields for thermal gas
billing 00 only:
<LS>Averaging type</>
<LS>Average of</>
<LS>Daily temp.</>
<LS>Fixed temp.</>
The temperature component can then be used to determine the volume
correction factor.
However, you can maintain these fields for the following exceptions:
You use thermal gas billing 01 and wish to make the calculated
temperature values available for calculation of the gas law deviation
factor.
You use thermal gas billing 02 and wish to make the temperature and
pressure (measured pressure, air pressure) available for calculation of
the gas law deviation factor.
You must select the <LS>Temp. extra</> field in both of these cases.

System Response

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

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.