In my GuiXT script I call a certain  function with CALL "ZCFM_CHECK_PARTNER_COMBINATION". The system displays an error message "No RFC authorization for function group ZCFM for user SAPCPIC".
Instead of the RFC user SAPCPIC, we suggest that you create you own user for RFC calls in GuiXT scripts. Then grant the right authorizations to this user, as described in our documentation, menu item "RFC" (first menu).