PAN number for one time vendor

Hi,

At the time of transaction against one time vendor with deduction of tds at the time of document saving

system are giving error "PAN number not available'"

Can any body infm me where we should update the PAN number for one time vendor as if we update the PAN number in one time venodr cin tab then for every one time vendor system is showing the same number ,

So pl suggest where we should maintain PAN number of one time vendor

I am in ECC6

Regards

Vijay