Diagnosis
For thermal gas billing 02, you can only maintain theTemp. extra field in combination with the Pressure extrafield.
This is due to technical reasons. Even if the pressure components suchas air pressure and measured pressure are not required, they would haveto be defined in Customizing for the volume correction factor procedurein this case.
The Temp. extra or Pressure extrafield is required in those cases when no temperature/pressurecomponent is calculated explicitly since the meter already compensatesfor temperature/pressure, but the temperature/pressure must still beavailable for calculating temperature/pressure-dependent componentssuch as the gas law deviation factor.