This was discussed earlier check this FDMEE integration with SAP S4 Hana
As well check these great blogs with detailed steps fishing with FDMEE: Universal Data Adapter for SAP HANA Data Source - Part 1
what you mean with "SAP Interface"?
I would like to connect to the SAP user interface, instead of database level(hana , oracle, or sql).
Is it possible?
Or is there way that user can extract out the data from SAP user interface and put the data directly to SQL view or Oracle database?
1) if you want to extract data from the GL or subledgers supported by the FDMEE-SAP adapters, you can use them. They extract data through the application layer (what you call SAP interface)
2) if you want to extract data from a Z-custom table, you may have to either customize the adapter or create your own script to extract data through SAP JCO or similar