IGT Groups for GT&C Requests not getting submitted - in PENDING status

We are having issues where we run the IGT Agreements (GT&C) Interface to pull GT&C's from GINV - we run it with the "Get GT&C List", and it spawns individual requests for each GT&C, and then is supposed to spawn individual requests for IGT Groups for GT&C interface for each GT&C.

The individual GT&C interface requests are submitted and complete successfully. Rows get inserted into IGT_DOCUMENT_REQUESTS for each GT&C (GET_GROUPS_FOR_GTCNUMBER), but these concurrent requests never get submitted. It seems like there is supposed to be a business event that gets triggered that is supposed to submit these, but that appears to not be working, and we are not familiar enough with how business events work to know what is missing or not running.