Authorization Object S_RFC 
Authorization check when using RFC to access program modules (such as function groups)
This authorization object contains the following three fields:
RFC_TYPE: Type of the RFC object to be protected
Currently, this field can take the value FUGR (function group).
.
RFC_NAME: Name of the RFC object to be protected:
Currently, this field contains the names of function groups.
This field can be a maximum of 18 characters and
a check is only executed on this length.
ACTVT: Activity
Currently, this field can take the value 16 (Execute).
If a user should be able to execute function modules of group 'ABCD' in the target system,
then the user needs the following authorization in the target system:
Activity: 16
Name of the RFC object to be protected: 'ABCD '
Type of the RFC object to be protected: FUGR