Not defaulting Organization and Location on IL Tax Detail form

Hi,

Regarding IL TAX Details Form. 

1)Created Tax Category for ST,STEC,STHEC

2)Attached Tax Category and Service Type on  Supplier Additional Form.

3)Created Stand alone AP Invoice :Entered Distribution and then Save it.

=> Service Tax automatically calculated.

4) Tried to Validate, i am getting the Error "You must Enter Organization,Location and or Service Type" in IL TAX Detail Form.

Why Organization,Location and or Service Type not defaulting ? Do we need to enter these values manually always after calculating Tax?

Thanks,

Hari.