Oracle Forms

Hi all,

I am working on form developed by some other party.
In this form one is control block which contains a combo box.
There is another data block which is based on a table.
When I run the form the records in this block are filtered by the value chosen in combo box.
But I am not able to find the code where this functionality is achieved.
I have checked WHERE clause property of block and the property is null.
Also default_where is not set at runtime.
Is there any other way to filter records in a block?

Thanks in advance.
MK