All report suites must have the same Conversion level

I'm highly surprised someone else has not posted this already, but I have a Dev Suite and a Prod suite that was set up by someone in the past that gives me the following error message if I try to update Success Event's name and Type at the same time.

All report suites must have the same Conversion level.

I've not been able to find definitive documentation for this type of error, so I thought I'd put it out to the community to see if you've run across this before.  I've been handling implementation for just under a year, and this is the first time I've run across this problem.  I only recently took over management of the suites.  Any insights are helpful.  Thanks in advance!