How to open a form based on the the parameter in another Form

I created a button in a form (FORM1). By clicking this button, I want to open another form (FORM2) based on the a value of one key field in this form(FORM1). Both forms have the same key field.
So, I wrote the following codes behind the PL/SQL Button Event Handler of the custom event for the button that I created in FORM1.
v_inventory_num:=p_session.get_value_as_NUMBER(
p_block_name => "_master_block",
p_attribute_name => 'A_INVENTORY_NUM',
p_index => 1
if v_inventory_num is not null then
portal30.wwa_app_module.set_target('/pls/portal30/PORTAL.wwa_app_module.link?p_arg_names=_moduleid&p_arg_values=5958032800&p_arg_names=_show_header&p_arg_values=YES&p_arg_names=A_INVENTORY_NUM&p_arg_values='||v_inventory_num,'CALL');
end if;
end;
I could not open the FORM2 by clicking the button on FORM1.
However,I can open the FORM2 by click the button by using the following code.
portal30.wwa_app_module.set_target('/pls/portal30/PORTAL30.wwa_app_module.new_instance?p_moduleid=5958032800','CALL');
How could I pass the parameter in FORM1 into FORM2 and when the FORM2 is opened if has already been queried with the passed parameter?
Your help would be highly appreciated!
Jeffrey Wei Ye

Hi:
Thank you for reply to my question.
I have tried your codes and apply them the following the form. However, I always got the following error:
Error: (WWV-00000)
No conversion performed for type INTEGER, value . (WWC-49102)
No conversion performed for type INTEGER, value . (WWC-49102)
No conversion performed for type INTEGER, value . (WWC-49102)
No conversion performed for type INTEGER, value . (WWC-49102)
My codes is:
declare
request_no number;
blk varchar2(30) := 'DEFAULT';
l_url varchar2(4000);
begin
request_no := p_session.get_value_as_NuMBER(
p_block_name => blk,
p_attribute_name => 'A_WORK_REQUEST_ID');
l_url := 'portal30.wwa_app_module.link?p_arg_names=_moduleid&p_arg_values=11880470335&p_arg_names=_sessionid&p_arg_values=&p_arg_names=work_request_id&p_arg_values='||request_no;
portal30.wwa_app_module.set_target(l_url,'call');
end;
then,
I created another form which has two fields and the dattype of pk is varchar2 and change manually put the pk's p_arg_value into the url.
e.g.
l_url:='PORTAL30.wwa_app_module.link?p_arg_names=_moduleid&p_arg_values=9029417810&p_arg_names=WORK_AREA_CD&p_arg_values=APP';
portal30.wwa_app_module.set_target(l_url,'call');
However, I still get the error message as below:
Error: (WWV-00000)
No conversion performed for type INTEGER, value . (WWC-49102)
No conversion performed for type INTEGER, value . (WWC-49102)
No conversion performed for type INTEGER, value . (WWC-49102)
No conversion performed for type INTEGER, value . (WWC-49102)
No conversion performed for type INTEGER, value . (WWC-49102)
Your help would be highly appreciated.
Wei Ye

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