Oracle Forms

I am new to forms.
I developed a form which has two blocks.
block1 uses the header table and retrieves the header information.
block2 uses the detail table and retieves the detail information. I joined both of the block using relations. (Batch_Id is common to both the tables)
I put below condition in WHEN-NEW-FORM-INSTANCE (in form level i.e module)

go_block('block1);
execute_query;
go_block('block2');
execute_query;

I dont know what I missed..My form is not displaying any data(data exist in the tables). I really appreciate your help in this regard.

Thanks in Advance!!