hi Mahendra,
It seem I traced the error but for sure, pls guide;
I went through this thread http://scn.sap.com/thread/2002259, which is stated the same problem (either it is not for RTP, but similar error in VL01n), its talk about to maintained the Tax in Sales View of Material Master material.
But here the question raised from my end w.r.t to material master maintenance with my client, we are not maintaining Tax in MM (Sales View), for any material in either FERT or what ever, due to zero tax or no tax policy - country. so meant no Tax need to maintained, if we on the Tax setting this will lead to updated all the Material Master I am afraid of. . . .
After complete work out it seem the implementation partner did some customization in SD to ignore/adjust the Tax determination part during VL01 or PGI for determine the Plant or/and other values.
Valuable in put required.
Regards
Muhammad Shoaib