Hi
Please let me know, whether you are having any Middleware in the project.
If you are having Middleware, than it is different approach.
If you are not having Middleware,
basically you can create RFC Function module in R/3 and deploy the same in CRM System and Trigger the same from R/3.
You can write the business logic in RFC to get the required data.
Let me know, if you have any clarifications
Regards
Madhan Doraikannan
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