Create/Change Object Activity - Attributes should not be allowed to define multiple times.

I found a possible redundancy in Create/Change Object activity.

1. We are able to add/define an attribute multiple times. I believe if an attribute and it’s value is already defined in Create/Change Object activity, Mendix should not allow users to redefine the same attribute. Because it’s already defined and the duplicate attributes becomes redundant.

2. Also if there are a lot of attributes to be defines it becomes confusing to users if they have already defined that attribute or not. Hence the list of attributes which is shown on click on new button of create/change object activity should not show the attributes which are already defined.