If so, you need SAP Universal ID. In a few months, SAP Universal ID will be the only option to login to SAP Community. Without it, you will lose your content and badges. If you have multiple accounts, use the Consolidation Tool to merge your content.
In MMBE, after maintaining required info (like material, plant and sloc) execute. In stock overview screen on top you will see material field which is NOT GRAYED OUT. Is there any reason why SAP has not grayed out that? purpose?