If an eject request fails after the exit has been invoked, the tape configuration database, your tape management system database, and the library manager database might report the library residency of the volume differently. To help avoid these discrepancies, on the initial call to the exit (UXJNCALL value UXJEJECT), the UXJCBACK indicator can be set by the exit. If this indicator is set and the eject request then fails, a failed eject notification call is made to the exit (UXJNCALL value UXJRFAIL). This call provides an opportunity for the tape management system to update its database information on the residency of the volume.