Opening multiple-record form in query mode

Hi,
I have two problems:
1. I have a portlet form based on a table that I would like to open in query mode. I've tried this code:
- in the "..before displaying the form" block :
WWV_MASTER_GENSYS_4 (
p_block_name => p_block_name ,
p_object_name => p_object_name,
p_instance => p_instance ,
p_event_type => p_event_type ,
p_user_args => p_user_args ,
p_session => p_session );
It brings back the first record successfully. But when I press the 'next' button, I get this error 'An unexpected error occurred:ORA-06502:PL/SQL:numeric or value error:NULL index table key value (WWV-16016)
2. I would like to display this form as a multiple records form. But it will only display one record at a time. Has anyone been able to do this?
I would appreciate any assistance in advance.
Thu

Maybe this will help you:
http://download-west.oracle.com/docs/cd/A87860_01/doc/server.817/a85397/operator.htm#1029184

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