Date for tax indicator determination in PO

Hello,

The Value Added Tax % has been recently changed in Spain (1st of september). To face this situation we've created new tax code indicators with the new %, and changed the 'Valid to' date in the condition records for the old indicators to the 31st august, and created new condition records for the new tax code indicators valid from the 1st september onwards.

In this customer, is very common to use existing PO's and add new positions instead creating new PO's. My issue is that, as far as I could check, the validity of the condition records is checked against the Document Date (EKKO-BEDAT), therefore when the user add new items to a existing PO (with document date prior to 1st september) the system determines the old tax indicator instead of the new one.

Is there any way to determine the tax indicator using a date at item level (preferably the Planned delivery date)???

Thanks in advance.

Best regards,

Jose