Confused by user reports - childs/detail

Question

SQL Dev user reports are very powerful and I like them very much. I am a little bit worried that I am not able to explore and employ all user report features. I found the documentation a little bit short. But maybe I overlooked something or I am not an explorer as I used to be.
My problems:
1) I do not know the difference between detail and child sub-reports
2) I have not figured out how to pass values from "parent" report into Script / plsql-dbms_output / code sub-report
What I am trying to do:
I have a log table LOG_MSG with inbound messages for entities. The message (table row) has ID and content.
There is also table LOG_ERROR which records errors for messages identified by ID (LOG_MSG.ID = LOG_ERROR.MSG_ID). I successfully used "Type: Detail, Style: Table" sub-report to display message errors for the active row. Neat :-)
Now I am facing this problem. Message is composed from values separated by `|'. I would like to parse a message and display in subreport each message parameter in new row. I have a PL/SQL procedure, which parses a message and stores the parameters in global temporary table. So the report SQL should be something like:
BEGIN P_PARSE (:ID); END;
SELECT *
FROM TMP_PARAMS;
Should I use Detail or Child type? Table / script / ... style? How to pass a parameter to Script subreport? My every attempt to pass a value from parent repor failed (:ID, &ID, #ID#) :-(
Thank you for your help.

Answer 1

Hi,
I have this report and it works:
Master:
select 'X' dummy, 123 num
from dual
union
select 'Y' dummy, 456 num
from dual
Detail (on single line and with bind variable in UPPERCASE):
declare bind1 varchar2(100) := :DUMMY; begin dbms_output.put_line ('There is '||bind1||' in master.'); end;
The column from master must be in uppercase when used in child pl/sql and whole pl/sql must be on single line.
Note the difference in upper/lowercase for dummy column. Even it is un lowercase in master, in child it must be in uppercase.
In this way it works for me.
Regards Libor