PO not getting Tax Code

Hi experts,

i created one PO with (account assignment catagery X)

with some xyz vendor. this PO not triggering Tax Code in the PO Invoice feald.

i am trying with another vendor and (acount assign cata X) its triggering Tax Code S3)

S3 IVA 16%

whats the reasons behind this problem. is there any setting behind this??

Regards,

Anthyodaya.

Edited by: anthyodaya Reddy Nagaram on Apr 6, 2010 5:15 PM