What is the function of CSA queues in CRM middleware

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We sometimes observe queues that start with CSA in the middleware transaction code SMQ2, the Inbound queue viewer:

What is the purpose of these queues? Many friends on SAP community have asked the same question, and some experts have answered it in the following two links:

Http://scn.sap.com/thread/2056716

Http://scn.sap.com/thread/2079157

To put it simply, each time the object in the CRM system is modified, if the object is set in the background configuration to synchronize its changes to other recipients, these CSA queues will be automatically generated and the changes will be synchronized to other recipients through these queues.

Before line 167 of the following figure is executed, the status of BDOC is as follows:

After the execution of line 167, the state of the BDOC changes.

A list of all listeners registered for CRM BDOC HIERARCHY_PROD changes is returned via function module SMW3_FLOW_GETLIST.

For BDOC HIERARCHY_PROD, there are currently three registered listeners in the system I am using:

When changes occur, these listeners execute one by one in the loop in the SMW3_FLOW_EXECUTE.

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