Can the TSSAI API Program be 'called' from the SMF Exit Program IEFUTL, which is re-entrant and residing in LPA? If "yes", how can this be done?
'Calling' TSSAI from the SMF Exit Program IEFUTL is no different than calling TSSAI from anywhere else. Be sure the code that is calling TSSAI is re-entrant. On a side note, making a RACROUTE 'call', from the SMF Exit Program IEFUTL, may be more appropriate than a call to TSSAI.
See Extending Security Using the Application Interface for more information on TSSAI.