User rights required to make a call to SAP RFC Function Module RFC_SYSTEM_INFO from JAVA application

When you use Java connector you need basic authorization to read metadata of Function Module. S_RFC is an authorization object for the RFC call.

This object contains the following fields

• RFC_TYPE Type of the RFC object you want to protect. You can pass the value 'FUGR'- function group) or 'FUNC'- function module.
• RFC_NAME Name of RFC to be protected. This file contains a value of the function group or of function modules.
• CTVT Activity

This field may take the value 16.
In case you want a user to be able to call function modules in-group 'ABCD' remotely, following user authorization is required

CALL FUNCTION 'AUTHORITY_CHECK_RFC'
   EXPORTING
      USERID = 'USER'
      FUNCTIONGROUP = 'ABCD'
   EXCEPTIONS
RFC_NO_AUTHORITY = 1.

To assign this object to a user, Use T-Code: SU01

You can also make use of Transaction SU03 to Maintain Authorizations or SU21 to maintain Authorization Objects as below

Also, note that your SAP function module has to be "remote enabled" and this can be done using T-Code: SE37.