There is none. Unless you are working in realtime you cannot learn SAP easily since all the modules are interrelated. For Finance you need to have knowledge about logistic and sales. For BW you need to know controlling If anyone doesnot have correct background it is a biggest career mistake to come in SAP. If you want to do Finance in SAP you must have a finance background (BBA, MBA) not IT background else sustaining in a job is a very very difficult task. Same with Logistics, you need to be a production engineering graduate to do that. I am not saying it cant be done but it is very very difficult.