Attribute of type Integer with Kind 'String'

Hi All,

I am using rtc 4.0.5. I have created a custom attribute of type integer.

I have set the kind also to Integer and added it to the presentation.

I open the workitem and it seems to be fine. Also it is editable.

Now the problem is when I set the kind to string,  it becomes read only in the presentation. When I open the WI I am not able to edit the field ?

Why is this happening ? is it a defect ?

Thanks

Varun