No Tax Should apply for a specifiec Purchase Order

Hi All,

Tax  should nt be applicable for Specifiec PO'S .

We understand that we can make  Not applicable for PO Lines based on the classifications like Product category,Transaction business category etc..However as we have more than 100 lines and we may not need Tax for that PO ( Which has more than 100 lines).In this scenario User cant go and update these determiation factor values for each lines.

Do we have any factor which will make not applicable for a PO instead PO Limes.

We have tried with 'Document sub Type , it was showing not applcable for PO .However when i match with Invoice it is calculating with default Tax Codes.