User variables being renamed to fmv1, fmv2, fmv3, etc.

I realized that I had spaces in my variable names, which was causing FrameMaker to perform substitution of fmv#

For example, instead of:

• Color lowercase
• Colors lowercase
• Color uppercase
• Colors uppercase

I should have used:

• Color_lowercase
• Colors_lowercase
• Color_uppercase
• Colors_uppercase

The FrameMaker 2015 documentation doesn't explicitly state that spaces are not allowed in variable names, and the FrameMaker interface permits spaces when typing name in the Add/Edit Variable pod. All the system variables have spaces in the name, so I didn't see issue with user variables having spaces. However, I notice that the documentation examples use underscores instead of spaces....