User Type

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think you can access table usr02 for the syst-uname and look at usr02-USTYP for a value of 'C'.

That is, if your system is set up so the rfc uses a userid of the appropriate type you will be able to identify when the rfc is being called by that type of user.

User type values are:
A Dialog
B System User (Internal RFC and Background Processing)
C Communication User (External RFC)
L Reference User
S Service User
And