Constant name has question mark inserted automatically

[wildcatherder]

I have placed a DBL constant on my Block Diagram with the name "PrevFlow_sccm".  As soon as I leave text editing mode, this is changed to "P?revFlow_sccm".  Note the question mark.  I know the software is trying to tell me something but I cannot understand it.

I thought it might be a duplicate name warning but nothing turns up in the same VI with that name.

Any ideas?

[wildcatherder]

I tried it without the "_" as "PrevFlow sccm".

It still gets changed to "P?revFlow sccm".

[wildcatherder · Accepted solution]

I deleted that constant and created another from scratch.  It worked OK.

The other constant had been inside a cluster constant.  I pulled it outside the cluster constant before attempting to edit it.  Apparently, that's not good enough.

[altenbach]

Where did the control inside the cluster come from originally. I wonder if it has some unicode in it.