In the task that you put on the error event handler, you can select the parameters that are available only in the error handler, for example, the system: Errordescription or system: Sourcename (which provided the task with which it failed). We use them as input variables for the stored process, which inserts into the error table (and sends an email to the failed process), which stores information other than the logging table. We also use the logging table to record our steps and in conjunction with the error, so that general error information goes there.
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