I have a simple weldment on a drawing. It has three sister parts that vary slightly so I want to save the first finished drawing as a new name and replace the model so I don't have to re-do this same drawing three times. I right click and hit "replace model". I only selected the view on the current sheet hoping it would work because when I checked All views it didn't. I then picked my new weldment as the New Model Part/Assembly and nothing happens. The box seems to be greyed out. This screenshot is after I selected the new part to be displayed. Whats going on here????

It will work if i pick a different replacement file