Hi guys!
Since, I'm in the process of learning, I hope someone can explain the problem that I faced now.
1.Department Head will choose approval status either "Approved" or "Rejected" and send the form to Director . I use Bean Shell to populate select box. 
2.Director will look up to that form(read-only). 
The problem is why approval status does not appear at read-only subform field which I think it is important for Director to know the approval status.
Thanks.