Problem in populating next record in Tabular Form

Question

on my Tabular form i have fields like :
VOY_REF, VISIT_NUM, FM_PORT_CODE, TO_PORT_CODE
when the user enter the visit number 2 i wanted to populate TO_PORT_CODE as 2nd visit's FM_PORT_CODE.
my code is working fine when every visit been saved before entering the next visit.
is there any way out without saving every row the user can enter all the visits and commit_form at the end?
WHEN-VALIDATE-ITEM Trigger
IF :TT_VOY_SCHEDULE.VISIT_NUM > 1 THEN
     DECLARE
          FMPORT VARCHAR2(5);
          CURSOR C1 IS
              SELECT TO_PORT_CODE
                 FROM TT_VOY_SCHEDULE
                 WHERE VISIT_NUM = :TT_VOY_SCHEDULE.VISIT_NUM - 1
                 AND VOY_REF   = :TT_VOY_SCHEDULE.VOY_REF;
     BEGIN
          OPEN C1;
          FETCH C1 INTO FMPORT;
          :TT_VOY_SCHEDULE.FM_PORT_CODE := FMPORT;
          CLOSE C1;
     END;
END IF;

Answer 1

basically i'm directly calling the TO_PORT_CODE value from the table TT_VOY_SCHEDULE. after commiting the Form only the data gets saved in the table. so when i call TO_PORT_CODE from the table it gives wrong detail.
that why once i enter a row i save the data so the table get updated. then i enter the 2nd line the information populate correct.
on your code you mean to say that i don't need to use cursor?