Set checkbox from procedure

Question

Hi,
What is the proper way to set / update a checkbox on a form from a procedure. The item "v_name" OUT parameter works fine. For some reason the checkbox_1 doesn't work. My procedure looks like so:
CREATE OR REPLACE PROCEDURE PR_SELECT_STUDENT (
     v_stu_id_in                         IN        NUMBER,
     v_name                              OUT      student.name%TYPE,
     v_checkbox_1                        OUT      student.checkbox_1%TYPE
IS
BEGIN
  SELECT name, checkbox_1 into v_name, v_checkbox_1
  FROM student WHERE Id = v_stu_id_in;
END;
     On Page Rendering, I have a PL/SQL after header process like:
PR_SELECT_STUDENT(
      :P10010_STU_ID,
      :p10010_name,
      :p10010_checkbox_2
);The :P10010_STU_ID item gets its value from a report page with an Edit link. The user click on the Edit link with student id from the report page to pass the student id into the form on a different page.

Answer 1

Setting :p10010_checkbox_2 := 'Y'; works but without it doesn't work. Weird.
I even added TRIM in the procedure but does not seem to help:
CREATE OR REPLACE PROCEDURE PR_SELECT_STUDENT (
     v_stu_id_in                         IN        NUMBER,
     v_name                              OUT      student.name%TYPE,
     v_checkbox_1                        OUT      student.checkbox_1%TYPE
IS
BEGIN
  SELECT name, TRIM(checkbox_1) into v_name, v_checkbox_1
  FROM student WHERE Id = v_stu_id_in;
END;