As withholding tax rates changes every year, there is a requirement to enter new rates in the system. Old rates are applicable till 31st Mar'07, so any entry related to withholding tax posted on 31st March'07 (F.Y. 1st Apr'06-31st Mar'07) will use old rates for tax deduction.
Now, if I change the rates (new rates are effective 1st April'07) , sap would use new rates for transactions posted in special periods also ( as there is no validity period entered), which actually should not be.
I don't want to create new tax codes every year. Is there any other solution or way through which tax rates can be made time dependent.