READ PROTECT Rules for Reference Atributes

[customaware]

I have a BO that contains the following

Question1 Yes/No
Question2 Yes/No
Results Reference Attribute.


I only want to show the Reference Attribute on the screen if Question1 and Question2 are both Yes. Also, Question2 show only be shown if Question1 is Yes.

I have the following dynamic Rules.

If BO.Question1 <> 'Yes'
READ PROTECT BO.Question2

If NOT(BO.Question1 = 'Yes' AND BO.Question2 = 'Yes')
READ PROTECT Results FOR ALL EXCEPT System

This does not seem to work properly.
When I open the form and both Question1 and Question2 are both Yes.....No Results shown

If I change them both to 'No' and Then back to to 'Yes' it works....but not always...it is inconsistent.

Is there any restriction on using READ PROTECT for Reference Attributes?