Retreive data from SAP to DM with Tcode FBL3N

Hello Everyone

I would like to know, how SAP DM works with SAP ECC (netweaver), i'ld like to retreive data from SAP to feed my DM, I've seen the great document provided by Marc where he explain how to get connected to Database , SQL server, SAP HANA, i'm wondering if you have any doc to explain not how to get connected to SAP Server, but how to retreive data

for exemple , is it possible de run tcode FBL3N

Thanks for your help