Oracle Forms 10g Trigger help

Question

Dear Techies,
I have a query in form triggers : when User enters a cost center and transaction year n go to lines a trigger should fire and query the existing transaction if it has the same cost center and transaction year. Please check the below detail explanation.
Headers block : transaction no , cost center and transaction year
Lines block : project no project code task and amount
Example : Headers : cost center : 232428 Transaction Year : 2012 Transaction no : 0000111 (Sequence generator which will effect after we enter d lines and save the form)
Lines : Project no : 455 Project code : xyz task : 788 Amount : 15500.
I have saved the form with above details. Next time I reopened the form and entered the same cost center : 232428 Transaction Year : 2012 (Same as above transaction) and
when i go to lines (click) a trigger should fire and query the existing transaction (0000111) since the transaction 0000111 has same cost center and year.
Please help me how can i achieve this.
Thanks and Regards,
Lakshmi

Answer 1

nani chowdary wrote:
also this error : FRM : 40654: Record has been updated by another user. Requery to see the change.
But no body is working on this form except me.After this post, i made a form and tested. There is no problem i get. i do it in a simple form of Scott schema. Here is the code
declare
     b number;
begin
     if :emp.empno is null then
          if :dept.deptno is not null then
               select count(empno) into b
               from emp
               where emp.deptno=:dept.deptno;
               if b>0 then
                    go_block('dept');
                    b:=:dept.deptno;
                    clear_block(no_commit);
                    set_block_property('dept',default_where,'deptno='||b);
                    execute_query;
               end if;
          end if;
     end if;
end;May be you have any other trigger which change the state of the form and caused this problem. Check that.
Hope this helps
Hamid