Why the "Synchronize with Item" property don't save?

Question

I created that table :-
create table syn (col1 number , col2 number);
and in forms 6i ..... I determinate col1 as the value for "Synchronize with Item" .
http://img169.imageshack.us/img169/6258/synar6.png
and when I test it in runtime , it work correctly and after I saved the data and get out of forms and went to database to ensure the data existing ... I surprised that the data in col2 not existing at all .... wholly empty
SQL> select*from syn;
COL1 COL2
1
2
3
4
5
6
7
8
8 rows selected.
why the item (COL2) don't save the data that inserted into it automatically by "Synchronize with Item" property ????

Answer 1

i should use copy property not Synchronize ?That's meant for copying values from master to detail, so it would probably not work as you want within the same record. I think you should set the value of the secondary item in pre-insert and pre-update triggers, depending on what you're actually trying to accomplish?