When a trigger is configured for exactly-once processing and Integration Server cannot determine whether the current document is a copy of one the trigger has already processed, Integration Server logs the document to the external RDBMS as an in doubt document.

If a transient error occurs while Integration Server is publishing, delivering, or retrieving a document for a trigger, Integration Server logs the document to the external RDBMS as a failed document.

If Integration Server has tried repeatedly to publish or deliver a document for a trigger from its outbound store and failed, Integration Server logs the document to the external RDBMS as a retries exceeded document.

For complete information, see the Working with webMethods Messaging Triggers section in the Publish-Subscribe Developer’s Guide.