Heavily depends on what specific incarnation of SAP you mean? If you want to have a SAP replacement for your specific use case, Rails CRUD is the only technolog

Heavily depends on what specific incarnation of SAP you mean? If you want to have a SAP replacement for your specific use case, Rails CRUD is the only technological component you need. The much more important part to the recipe is knowledge of the domain model. That's also where SAP's moat lies. Not with it's technological underpinning, but with the all the different industries and their processes which they've transferred into lines of code (and the ability to extend them with further LOC with the help of a "SAP consultant").