When adding an attribute named "Column Id", as soon as I leave the name field erwin raises a warning and automatically renames the column by adding a __2 suffix.
Note this is not a duplicate attribute name in this entity. I have looked everywhere I can think of where attribute names are managed to see if there is something hidden with the same name but I found nothing.
Here is the full warning:
ESX-32720: Setting 'Column Id__2' as the name on the Attribute instead of 'Column Id'.
Object type identifier = 1075838981
Object id = 268
Property type identifier = 1073742126