We have an issue in Purchase order related to tax code. The scenario is VAT rates are recently revised and raised to 14%. So for that we created a new tax code with the validity period from 7-sep-2012. Now the PO's which are of earlier date means document date of PO is earlier than 7-sep-2012 validity period of Tax code causing the issue. whenever we are trying to use this tax code in old document date PO's it gives error like "TAX CODE Y6 does not exist in TAX PROCEDURE TAXINN".
I know this error coming because of validity period of Tax code. Now my concern is how we can use this tax code for earlier PO's. Is there work around availabe in PO to change either document date of it or any abatement process available in PO which can lead us to use the new tax code without changing neither PO documet date or Tax code Validity period.