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.
I know that logical systems are relevant when sending IDOC requests to SAP. How relevant are logical systems when sending BAPI or RFM requests? Can someone please throw some light on this?