Do I Have to Commit in PL/SQL block?

Question

Hello all,
i got plsql block in application process after button press like this:
insert into ideas
(IDEA_ID, USER_PID, DESCRIPTION, AREA, PRODUCT_FAMILY, FF, CHANGE_PN, PN_NUMBER, PROBLEM,
SOLUTION, SAVINGS, EVALUATOR_PID, DB_DATE, EVALUATION_TERM, LOC, STATUS, TYPE, POINTS_OR_MONEY,
AUTHOR_NOTE)
values
(zn_no, v ('USER'), :P6_DESCRIPTION, :P6_AREA, :P6_PRODUCT_FAMILY, :P6_FOCUS_FACTORY,
NVL(:P6_CHANGE_PN,'N'), :P6_PN_NUMBER, :P6_PROBLEM, :P6_SOLUTION, :P6_SAVINGS,
:P6_EVALUATOR_NAME, SYSDATE, SYSDATE+14, :F300_LOCATION, 1, 2, DECODE(:F300_LOCATION, 1, 'M', :P6_POINT_OR_MONEY),
:P6_AUTHOR_NOTE);
insert into authors (idea_id, author_pid, participation, group_id)
(select zn_no, author_pid, participation, group_id from tmp_authors where group_id = :P6_AUTHORS_SEQ);
authors.idea_id is foreign key to ideas.idea_id.
But sometimes it only inserts into first table (ideas), but not to second(authors). I thought, that i don't need to commit explicitly, but now i doubt about it.
Do you have any suggestions what else can be wrong?
I'm running Apex 3.0 on Orale 10g r2@SLES9

Answer 1

I've added test for SQL%ROWCOUNT :
IF SQL%ROWCOUNT = 0 THEN
sql_error := 'Page 7: Cannot find the author';
RAISE CANNOT_FIND_AUTHOR;
END IF;
When, if raised, i'll call rollback. I guess this should be enough to ensure that both insert statement was success.