Fetch rows on Update page

Question

I have two tables, one is project_header, another is project_comments. looks like below:
Project_Header:
TrackNum Number Primary Key
Project_Type varchar2(10)
Filed_By varchar2(25)
Logged_Date date
Project_Comments
Comments varchar2(4000)
Comm_Header varchar2(50)
TrackNum number Foreign Key
Detail page is a vertical report(SQL Query Type) listing all of column values of the two tables for a pariticular TrackNum.
when click on Update button on the detail page, it will direct to Update page. On Update page rendering, I perform two processes,
one is Automated Row Fetch from PRS_Header table, there is no problem. For another, is a process with PL/SQL
anonymous block. The source is below:
select COMM_HEADER||COMMENTS into :P3_COMMENTS from PROJECT_COMMENTS
where TRACKNUM = :P3_TRACKNUM
But when running, COMMENTS cannot come out. What's wrong?

Answer 1

Scott,
Thank you very much for quick reply!
I think my code:
select COMM_HEADER||COMMENTS into :P3_COMMENTS from PROJECT_COMMENTS
where TRACKNUM = :P3_TRACKNUM
seems similiar with the example
select ename,job,mgr,hiredate,sal,comm,deptno into :P6_ENAME,:P6_JOB,:P6_MGR,:P6_HIREDATE,:P6_SAL,:P6_COMM,:P6_DEPTNO from emp where empno = :P6_EMPNO
on Automated Row Fetch, when does the value hit the session state?
But it seems not work for me?
Checking the Session State, item P3_COMMENTS has it's value. Why it cannot display out?