What is sap: I have to develop a

I have to develop a synchronous communication method with sap . Thinking of using proxy or RFC. Can you suggest if proxy is better over RFC?? Our customers want to use the override in variable pay. In the override, they should also be able to enter 0 (so that even though person had bonus calculaton of for example 500 EUR, we can override to 0 EUR). Hi Folks, in the last months I worked a lot with UI5 and as recommanded by SAP , I've used oData for the connection. Now I'm facing some limitations with it. I've discussed it with other persons who told me that they are working only with REST. That's why now I would like to create a kind a comparison on both connections: advantage and drawbacks. As this is an application that should work generically with any SAP implementation, I cannot write a custom RFC for this task, and I need to use an RFC that also allows for filter conditions (i.e.