Akshay,
This error occurred in testing recently performed on MM_EKKO. Testing UID's also had SAP_ALL. The authorization error in the output from executing RM06EV70 in this case, is unrelated to the application specific authorizations for MM_EKKO. If material ledger is active, try note 2057485.
The Note fixed this issue because Material Ledger is active. Good Luck.
Best,
DM