You should protect the ACBNAME used for RRSF. You can do this using the following definitions. You should first do a SETROPTS LIST and an RLIST VTAMAPPL * to see what you already have set up, so you do not repeat steps you have already done.

SETROPTS CLASSACT(VTAMAPPL)    +
         RACLIST(VTAMAPPL)     +  << Required
         AUDIT(VTAMAPPL)       +  << Optional
         GENERIC(VTAMAPPL)        << Optional, recommended

RDEFINE VTAMAPPL acbname UACC(NONE)

SETROPTS RACLIST(VTAMAPPL) REFRESH

You can use a generic profile to cover acbname instead of the discrete profile shown, but be careful if you do this because a generic profile could affect existing applications.