Module for AS4 as Responding MSH
When Module for AS4 plays the role of responding MSH, use the wm.ip.estd.as4.msh.userMessageSubmit service to submit a reply user message for the corresponding request user message. The refToMessageId of the reply user message should be set to the request user message's MessageId value. The module uses the requestUM leg of the TPA to process the request user message and sends the reply to the initiating MSH.
Module for AS4 uses the Trading Networks database as the MPC queue. When a user message is queued, the message is stored in Trading Networks with a UserStatus of QUEUED, and the corresponding bizDocId is cached.