Dear All
We were able to solve this issue , by using Enhancement for tcodes where Sales Office is used (i.e va01 , va02 , va03 , va21 , va22 , va23).
You have to check auth object for Sales Office (V_VBKA_VKO) in enhancement and manually add this object in PFCG Role for all the users where required.
Regards
Urvish