> For the complete documentation index, see [llms.txt](https://docs.editran.onesait.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.editran.onesait.com/documentacion-editran/ibm-editran-v5.3-cics-en/utilities-and-codes/appendix-b.-exception-procedure.md).

# Appendix B. Exception procedure

The exception procedure is executed by editran with an A7I message when an incident occurs that prevents a complete send or receive operation from being carried out. For it to be generated, it is necessary that sending/receiving was in progress or intended. The exception procedure is started with a parm Xzzz, where X indicates whether the problem is in transmission or reception, and zzz indicates the reference code of the problem. If sending and receiving were taking place simultaneously, in some cases 2 A7I messages are generated (one Exxx and another Rxxx). Once the A7I code has been received, the following must be done:

* Inform the Installation Operator of the incident, with the corresponding comment. In non-retryable cases, it is likely that you will have to contact the remote operator to resolve the situation.
* Depending on the Reference Code of the A7I message, you can retry the transmission or reception of the session involved. There is a subset of Reference Codes for which you should not retry unless the error is fixed (to avoid the risk of a loop). The other codes can be retried to complete the full transmission, although you should retry a finite number of times, since it is always possible that an unexpected error will lead to a loop situation.


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