To identify the caller of the SSI, check the VRA. It contains the return address of the invoker of the IEFSSREQ macro (the caller of the SSI).

If the VRA is not available, locate the linkage stack associated with the work unit that was in control at the time of the error, and use the IPCS linkage stack formatting support to analyze the entries. The PSW from the current linkage stack entry is the caller's return address (assuming that the subsystem function routine did not issue any instructions that caused additional linkage stack entries).

Browse backward through storage from the PSW address to find an eyecatcher and identify the caller.