@fred.cousin, I doubt anyone in this forum will have both SAP and DSS knowledge, I don't think your query will get a detailed answer.

The API being a RESTful API, I guess it should not be too difficult for you to get SAP to query DSS and retrieve data. Several of our customers have made DSS - SAP integrations. I also heard that depending on the asset classes you use, you might have to massage the data for SAP to digest it. Thomson Reuters consultants might also be able to make one for you, if that is of interest to you I suggest you contact your local account manager.