SAP S/4 HANA

We currently use Microsoft Navision and will be implementing SAP S/4 HANA. I was under the impression that I would be able to build up the data in a very similar fashion to what I have done with the Navision data. For example, our sales data consists of two basic tables "Sales Invoice Header" and "Sales Invoice Line". I envisioned in SAP, there would be "Sales Invoice Header" and "Sales Invoice Line" datasets that I would extract. Obviously, they wouldn't contain exactly the same information from one system to another, but the basics would be there, Invoice Number, Customer Number, Item Number, Price, etc.

However, I have been told by our project manager that it is nearly impossible to build up the data in an ETL using source datasets from SAP. I just can't quite wrap my head around how it would be possible for the data to be so fragmented that I can't pull source datasets from SAP and transform them in the ETL to make them useful.

Are there any users who have had experience connecting and building SAP S/4 HANA data in Domo who could share their experience and how they are connecting and transforming their data?

Thanks!