SAP Message AH694 - Gas procedure &1 vol. corr. factor proc. &2: fixed temp. key is missing

Diagnosis
You have selected the specified volume correctionfactor procedure as the gas procedure. Thetemperature component is determined as a fixed temperature for thisprocedure. Therefore, a fixed temperature key is required for theregister.

System Response
Error

Procedure
Enter an appropriate fixed temperature key, or select a different gasprocedure that does not require a fixed temperature.