Hello Rose,
As mentioned by Claire, please check application log (t-code SLG1 or /SAPTRX/ASAPLOG) if enabled.
When posting Rule proc from AII -> OER, do you use standard activity EPCIS_EVENT_SEND_TO_XI ? What customization/ custom objects do you have on AII & OER side ? Please provide more details about this.
looks like two processes are trying to update EH at the same time, causing the issue. You can take ABAPer help to debug the issue.
Also Check for locked EHs in table /SAPTRX/LOCKEDEH. Run the locked EH job (/SAPTRX/PROCESS_LOCKED_EH) to ensure that all events have been posted.
- /SAPTRX/LOCKED_PROC - Process Event Messages for Locked Event Handler
- /SAPTRX/LOCKED_PSET - Process Locked Event Handler Sets
For more details check Kevin's blog - SAP EM Blog Series #11 - Troubleshooting tips
Hope this helps.
Regards,
NRS