Best Practice for SOAP 3.0 Receiver SAP Username

Hi,

When using SOAP 3.0 as the receiver, we need to supply SAP username to access the ecc target host url.

My question is whether or not we should give this SAP user the SAP_ALL role?

If I have 10 scenarios that consist of 10 SAP functions for various tasks such as dumping data from ECC to SQLSERVER or passing parameter from a file in FTP to a function in ECC through PROXY, do we need to give authorization for each object to the underlying sap user in SOAP adapter? so just one user for each scenario?

Is this SAP user provided in SOAP adapter need access to execute those functions in SAP? or not?

What is the difference between SAP username in SOAP with SAP username in RFC adapter in terms of user role?

Thanks,

Sam