TFS 'when' and 'required' rules does not set the field to required

Question

I have a custom field (fixedInVersion), the field is required when state = 'Closed'.

I also have a custom control for the field (combo with sorting, because the default sorting of TFS control is ascending).

When the work Item state is Closed, I display in my control Required but the user can still save the work item without getting error.

Does anyone knows what is the problem? If I remove the text Required the item cannot be saved, but the only indication for the user is that the combo is yellow (no text Required is displayed).

Answer 1

The "When" Required value, did you use it? see the following example:

<FieldDefinition refname="fixedInVersion" name="fixedInVersion" type="String">
  <WHEN field="System.State" value="Closed">
    <REQUIRED />
  </WHEN>
</FieldDefinition>