Dear,
see below screen shot ,If you check the Box Taxes and Licencee in Account Group Level then system can not all you to save the new customer master creation without these values .But in Sales Order ,you are saying ,you have developed new Field ,I am not sure this field value will get by that Customer Master Value but you can maintain In-completion Log for this Field in In-completion Procedure then system can not allow you without this field value in VA01 .
See attached screen shot of OBD2 T.code .
If you have any doubts please let me know .
Thanks,
Naren
