Dear Paula & Virinchy
thanks for your posts! Because of your helpful answers I think there is no classical master guide which I was used to have. E.g. help.sap.com/erp --> SAP ERP > SAP ERP 6.0 EHP8 > Master Guide
Under help.sap.com/s4hana > "SAP S/4HANA, on-premise *" it doesn't exist obviously
Have a nice day!
BR Manuel