When you enter a new Conditional Disable Symbol and Value from the Properties window, or edit a value, the string entry boxes are NOT limited to single line entry. If you hit "Enter" when you are finished typing, it will insert a line feed.
There is an error check to catch this error (or any non-alphanumeric/underscore character) when you click "Add", but based on the layout of the window, why not limit to single line?
I can't check, but I'm willing to be this has been in place since the Project and or Conditional Disable structure were introduced. Any takers?
Moved to CAR database: CAR 559803