Double-slash field icon @ model viewer

[gmenoutis]

On my app's model viewer, I get one field showing a strange double-slash icon (kinda reminds me of the comment chars?).

What is this?

See it in the screenshot below, on the Transaction Date field.

[sunny_talwar]

Thanks for sharing the video Michael!!

[Anonymous]

Thanks!  When I looked at my Data Model Viewer, the Expand All button was selected, so I was confused as to how this could have happened.

I played around and determined that you can get the slash instead of the key if you use keyboard commands ([CTRL]-[+] or [CTRL]-[–]) to resize the display rather than using the zoom controls that are built into the Data Model Viewer.  Doesn't affect the fix but I thought other people might wonder, too.

[pover]

Doesn't the double-slash icon take up the same amount of space as the key icon? Why does this exist?