Greyed out enumerated constant?

[TomChilders]

I'm trying to figure out the significance of greyed out enumerated constant above.

When I switch to another selection and back, the constant no longer appears greyed out.

From what I can tell, it doesn't seem to be anything in the display format, properties, nor is it disabled.

Any ideas on what it means?

[James.M · Accepted solution]

Has the type def been updated? Is the array empty?

[TomChilders]

Thanks, the TypeDef had been updated by a co-worker.

[James.M]

Yeah, those pesky coworkers. I'm glad NI added the Confirm feature to type-def updates for this reason.