Hi Jerry,
This issue seems strange thing, i see there is another field with name product id what is that field?
You can check the structure used for context node in GET_TABLE_LINE_SAMPLE in context node class.Here you will be having all the list of attributes used in context node attributes.
You can check whether you will be able to see product id field. I think you have added product id 2 one is value attribute and bol attribute.
Best Regards,
Dharmakasi.