Oracle DataWarehouse between S/4HANA and SAC Planning

[nalmai]

Dear community,

I am reaching out to you concerning the following. My client embarked the SAP roadmap by buying S/4HANA FIN core, Ariba, & Fieldglass and SAC (planning) without the Datawarehouse functionality within de SAP-Stack and would like to stick to there Oracle DWH. 

I have no experience with this scenario and I am concerned concerning the following.

S/4HANA > Oracle DWH: Are we still able to use the standard business content extractors with the same functionality as if we are using DWH on HANA technologie.

Oracle DWH > SAC planning: Writeback functionality is it possible and if yes what is exactly required and  are we loosing any functionality

Oracle DWH > SAC: Hiërarchie functionality is there a delta between live & extract and is there a delta between HANA & Oracle

Oracle DWH > SAC: date notation same question as above

Oracle DWH > SAC: Attribuut time dependent, navigational same question as above

Let me know you thoughts or guide me to the right resources. Any light on this issue is welcome.

Your prompt reply is valued & much appreciated.

Regards,

nalmai