error in ME21N : Authorization Object does not match EFB PID

Hello All

In one of our client we are getting the error as "Authorization Object does not match EFB PID" while executing Tcode ME21N. I have checked in User parameters EFB is not maintained but i am not sure if this is the reason for this error. if this is the case then can somebody tell me what value should i enter against EFB in user parameter. i have tried entering X but in Vain.

Also would like to know where one can see EFB parameter value in SPRO.

It is urgent.

regards

Yogesh