Hi Rohit,
Thank you for your reply, now i have got little bit clarity about it.
But still i am having few more doubts about it.
As in your reply you asked to maintain Tax n all in Counter party Role , company code tab but i was not able to find out any SPRO node where i can do any setting related to Tax and BP or their assignment to each other? Kindly have a look of it.
But i have found one place in Derived flows where tax codes could be assigned.
Thanx & regard, Ashish