Why doesn’t the System allow You to Change the ‘Tax Category’ in a GL A/C Master?

You will be able to change the ‘Company Code’ related fields such as tax category, currency, etc., provided that there has not been any posting to these accounts. Pay attention to the following:

1. If you need to denote an existing GL account to later be managed on an ‘open item basis’ or vice versa, then make sure that the account balance is zero in either case.
2. If you are trying to change an existing ‘reconciliation account’ (to a regular GL), then make sure that the account has not been posted to.
3. If you are attempting to denote an existing ordinary GL account into a ‘reconciliation account,’ ensure that the account has a zero balance.