The non-blocking download acknowledgement transaction is only performed when a download acknowledgement is received. This transaction has two purposes. The scripts publication_nonblocking_download_ack and nonblocking_download_ack are run in this transaction; they help download status tracking. Secondly, download timestamps in the MobiLink system tables are updated during this transaction.
This transaction may not be performed on the same database connection as the other events for the target synchronization so no connection level variables may be referenced in this transaction.