I have a system that was shipped at R9.1. I am adding it to a SCN with centralized VM where all of the systems are at 9.0.6.0.979. The company just paid for all the upgrades and do not want to upgrade all of the systems again. I know that the SCN works fine as long as the systems are within one release, but have been told and experienced multiple issues with centralized VM on different releases. I have set up the new system at 9.1 and made the first call and get the confirmation in System Status. My question is after I downgrade the system. Will I still be able to tell that I made the call at R9.1 or will I need to buy an Upgrade license when going to R9.1 later this year. Thanks in advance.