I have been chasing this issue with Epicor Support and the CAM for weeks now and they cannot seem to give me any information on SQL Runtime.
All I can assume is Great Plains does a similar thing and it stipulates the following per their well-written documentation.
1.) No other 3rd-party databases can be installed inside the licensed instance. Only the ERP databases can be used.
2.) CAL licensing applies to SQL depending on the CALs for the ERP software. If you have 50 Epicor CALs, then the number of CALs cannot exceeded this in SQL.
Per the previous comments, it appears SQL Runtime is just like Standard but with those 2 aforementioned licensing restrictions.
Can someone please confirm if this sounds correct?