When performing nonstandard interfacing from SAP to SAP XI to external will it be better to create a nonstandard IDoc or will the creation of a proxy be more stable and speed up communication?
The question of IDoc or not is a question of the strategy. An IDoc creates an additional copy of the sent data in the SAP system. This IDoc can be inspected if need be. However, when connecting to middleware the best practice is to NOT hold redundant transfer files in the connected systems. If you work with middleware (like XI) then your ultimate goal should be that all administration and error tracing takes place there and only there. The performance between IDocs and Proxy will probably be indifferent.
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