The SSIBSSNM field of the SSIB control block identifies the subsystem targeted by the current SSI request. The VRA contains the address of the SSOB control block used to route the current request, and also contains the address of the SSIB if the error did not occur while validating the SSOB control block chain. Note that the SSIB and SSOB control blocks pointed to by the VRA may be copies of the control blocks originally provided by the SSIs caller, and may contain information other than what was provided in the original control blocks. The VRA contains the address of the SSOB control block, and the SSOBSSIB field of the SSOB control block locates the SSIB control block. The SSOBINDV field, if non-zero, points to the SSOB extension originally provided by the caller.

You can also use the current SSCVT to identify the current subsystem. If the address of the SSCVT appears in the VRA, the SSCTSNAM field identifies the subsystem.

If the footprints indicate that the error occurred while locating the target subsystem, and the SSI was processing a broadcast request, the VRA identifies the last successfully processed subsystem. The VRA section with the header 'LAST PROCESSED SSCVT', lists the address of the last subsystem to which the current request was successfully routed. Subsystems receive broadcast requests in the order in which they appear in the SSCVT chain (anchored by the JESSSCT field of the JESCT data area). The failing subsystem should be the next one in the SSCVT chain.