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How to persist multi value IBA using event listener (Create and Update of object)
You can listen for VersionControlServiceEvent.NEW_VERSION or VersionControlServiceEvent.NEW_ITERATION. See below article to update the attributes using Listener .
Also, You can set below verbosity to true in wt.properties to check event keys for create or update
wt.services.verbose
wt.services.verboseEvents
Hope it helps !!!
Thanks
Shreyas