One of our client is using sap bw 7.4 on hana. Main objective of this system is to have reporting on Cost & BOM. Distribute the finance data to third party system using BODS. No standard extractors are used and data is extracted from webdynpro applications and there are many abap programs also in the system. Now planning to migrate to bw/4hana and please advise which approach is better in-place or remote or shell conversation approach.