Error assigning value to page item

I create a "SQL Query (Pl/Sql Function Body Returning
Sql Query)" region, and also an item on the page called
:P1_TEST.
In the Region Source for the region, I have the following
codes:
declare l_sql varchar2(32676);
BEGIN
:P1_TEST := 0;
l_sql := 'select emp_id from emp';
return l_sql;
END;
When I click on "Apply Change" button, I got the
following error:
ERR-1002 Unable to find item ID for item "P1_TEST" in application "4000".
Any reason why I got the error?

Re: how to get the parsed  last query (report)

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