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For configuring communication with backend systems from SAP SRM first we should define following steps:

Defining Logical system:

Define logical system in below mentioned path:

SPRO → Supplier Relationship Management → SRM Server → Technical Basic Settings → ALE Settings (Logical System) → Distribution (ALE) → Basic Settings → Logical Systems → Define Logical System.

Defining RFC destination:

SAP Enterprise Buyer communicates with any backend system using RFC.

Define RFC connections in SRM in below path:

               Supplier Relationship Management → SRM Server → Technical Basic Settings

               → Define RFC Destinations.

If we have more than one R/3 backend system, define an RFC destination for each one.

We also have to define RFC destination for SAP Enterprise buyer in R/3.

Defining Backend System

Please follow below path to define backend systems in SAP SRM:

         SPRO → Supplier Relationship Management → SRM Server → Technical Basic Settings → Define Backend Systems.

For creating follow-on documents in SRM: Enter the logical system, destination, system type of the SRM system and define SRM system as local.

 For creating follow-on documents in backend system: Enter the logical system, destination and system type of the backend system and select the RFC indicator if the logical system is RFC-compatible.

Now connections are defined from SRM to R/3.We can determine which backend system should be used to create follow-on documents as mentioned in my previous  blog determining backend systems.

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