Advance Table in advance table via view link

Hi All,
I have implemented advance table in advance table to show details region data by creating View Link between master and child View Object.
I have followed all the steps mention in following link
http://oracleanil.blogspot.com/2010/06/advanced-table-in-advanced-table-via.html
Now when I am using child VO in details table region it is giving me null pointer exception.
Please Help.
Regards,SHD

Any Clue?

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