Hi Rajesh,
Jurgen is right, if you are good in debugging u can debug and find the authorization objects else you google then u can get the authorization objects in detail.
for MM_EKKO below are the authorization objects..
for RFQs,
M_ANFR_EKO
M_ANFR_EKG
M_ANFR_BSA
M_ANFR_WRK
for Purchase orders
M_BEST_EKO
M_BEST_EKG
M_BEST_BSA
M_BEST_WRK
Contracts/Scheduling Agreements
M_RAHM_EKO
M_RAHM_EKG
M_RAHM_BSA
M_RAHM_WRK
Thanks,
Ningappa S M