Default Value in a DFF is not getting populated in Self Service Page

Question

I had an issue in Self Service Page.
In the SS page there is hidden mandatory field in DFF segment,which should get populated with a default select statement.
But this field is not getting populated with the default values.
But this is working fine in Forms , i.e the default value is populated in forms.
Why the default value is not populated in Self Service Pages?
For Eg: If there is a DFF "SAMPLE_DFF" which has some context with segment
Context Code : GB_CODE
Segment : "Enter the Group"
and this segment is made required and defaulted with a select stmt (select stmt returns 'XXXXX')
In forms if am not entering any value, then its defaulted to 'XXXXX'.
But in Self Service this is not happening.
Can anybody help me out...

Answer 1

Actually, I have narrowed down the problem. It is not quite the same.
DFF is Receivables, Address Information (Release 12). We have 2 attributes defined and we want the default value of the 2nd to be dependent on what the user selects in the 1st.
So the default value of the 2nd is defined as a SQL Statement, select :$FLEX$.INDUSTRY_CODE from dual (where INDUSTRY_CODE is the value set name from the 1st).
We know the syntax is correct because if we actually hardcode a default value in the 1st attribute (select 'BLAH' from dual), then we do see that the default value for the 2nd attribute fills in with BLAH as well. However, we do not want that. We want the user to choose a value for the 1st attribute from the LOV, and then have the 2nd attribute default to that same value. This is the part that does not seem to work in OAF, but definitely used to work in Forms.
Any thoughts?
Thanks much!