PXView not available in Customization Editor

I am trying to modify EP305000 / TimeCardMaint, by adding a new view that would show PMTimeActivity that are ‘Open’ or were not EndDate has been specified. I bleive by View works fine as it is used in a function Action, however it is not available in the Customization Editor, view the ‘Add Data Fields’ tab of the screen editor.

What do you think the problem could be?

    public class TimeCardMaint_Ext : PXGraphExtension<PX.Objects.EP.TimeCardMaint>
    {
        public static bool IsActive() => (true);



        [PXViewName("Active Time Activity")]
        public PXSelectJoin<EPTimecardTask,
            InnerJoin<CREmployee, On<CREmployee.defContactID, Equal<EPTimecardTask.ownerID>>>,
            Where<CREmployee.bAccountID, Equal<Current<EPTimeCard.employeeID>>,
                And<EPTimecardTask.ownerID, Equal<Current<EPEmployee.defContactID>>,
                  And<EPTimecardTask.weekID, Equal<Current<EPTimeCard.weekId>>
                      ,
                      And<EPTimecardTask.uistatus, Equal<ActivityStatusListAttribute.open>>

                      >
            >
        >> ActiveTimeActivity;

}