How to implement the subscriber pattern in CRM middleware

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It is observed in the service code SMW01 that a BDOC may be sent to more than one destination site. For example, the five site shown in the figure below will receive the site, and the highlighted SMOF_ERPSITE represents the client 504 of the ERP system QI3 will receive the BDOC.

So where did the site in the above list come from?

Take BDOCPRODUCT_MAT as an example, maintain the callback function in the view SMW3FDBDOC:

The first callback, SMOH_REPLICATION_WRAPPER_MSG, is responsible for determining which site the BDOC needs to be sent from CRM.

This callback is automatically generated:

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