RTC: Why is the attribute name shown on the workitem editor instead of the attribute label when it is required?

Hi,
I am using RTC (both eclipse and web clients) 4.0.6 although this is an known issue for issue for quite some time.
Here's my problem:
Let's say I want to the change the label of the OOTB "Filed Against" attribute to "Category", so I do the following:
1) Go to the Project Configuration -> Configuration Data --> Work Items - > Editor Presentations
2) Choose the editor presentation to be edited, then select the attribute and set Label (Option) to "Category", as it is shown in the following picture:


3) Save the changes on the Project Area.
4) Create a work item using the attribute recently modified and having the "Filed Against" attribute labeled as "Category" as required on creation. I do not fill that field.
5) Then, when try to save the work item, the system throws a message on screen asking me to set the required attribute, but instead of showing the new label on the message, it shows the "real name" of the attribute, as I shown here:



So my questions are:
1) Is this a bug or a tool limitation? If not,
2) Is there any other way to get the "desired label" shown on that message instead of the "real name" of the attribute?

I will appreciate any kind of guidance you can point me out.

Thanks!
Vicky