Object linkages can also be performed manually via Program /BTI/TE_REP_MDR_OBJECT_LINK if required.
From this screen it is possible to create linkages for individual SAP objects or for specific types of objects (e.g. Transactions, Includes etc).
The reality is you should not need to do this manually if you have set up a frequently running job as outlined as part of the pre-requisite Diffuser setup.
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