oracle open form with parameter

hi
i have form open within a button of another form passing a value to open as the follwoing :\
1-st form

 COPY(null,'GLOBAL.form_id');
  :global.form_id := rec_id;
   CALL_FORM('PO');

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PO form
If :global.form_id is not null then
v_ID_where := 'po_id = ' || :global.form_id;
Set_block_property('PO_M', default_where, v_ID_where);
go_block('PO_M');
Execute_Query;
ERASE('GLOBAL.form_id');

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the form called ok when it open from the 1st form , but when i open po form alone , it sent error message that variable not found
NiceMan331Asked:
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NiceMan331Author Commented:
I forget to say that the code in second form written for : when new form instance trigger
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flow01Commented:
Referrencing a global variable that is not set gives an error.
So assign a default variable before:

Default_Value(NULL,'global.form_id');
If :global.form_id is not null then
   ...
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NiceMan331Author Commented:
Setting default value when created in the 1st form ?
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NiceMan331Author Commented:
OK , Done
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