Hi,
This is coming from GET_<field name> method of attribute in your context node.Because your data binding is not correct i.e your collection is initial.
Describe what you are trying to do exactly , from where you are passing data to your view or fetching, Problem is there.
Set parameter BSPWD_SHOW_NOT_BOUND to value N in user profile in SU3 to ignore this(Product_Header not bound) .
Regards,