Manifesto is “more than a declaration of our current contributions; it’s a promise to continue driving open innovation and collaboration at a significant scale,” says SAP CTO. It arrives alongside the announcement of SAP’s Open Reference Architecture project as part of the EU’s IPCEI-CIS initiative. It’s an open secret that even proprietary software contains open source components these days, and major vendors are, to varying extents, supporting or participating in open source projects. However, all such contributions are not created equal. Software giant SAP, a longtime contributor to open so…