Have to prevent navigation to another stacked canvas.

Question

Dear all,
I am developing an application using forms 6i with oracle 10g.i have many stacked canvas in this application.where in one particular canvas i have a button namely 'SUBMIT' in which i have a trigger when-button-pressed
with following code.
go_block('to_sanct');
declare
g char(1);
begin
          message('value is '||:gd_ind);
     if :gd_ind is not null then
     if :gd_ind = 'Y' then
          G:='Y';
     ELSE
          G:='N';
     end if;
          MESSAGE('IN');
          MESSAGE('TRANS ID'||:c_trans);
          MESSAGE('head '||:c_head);--navigation occurs after this message.***
          MESSAGE('gd value '||G);
Leave_application.grant_or_deny_leave(:c_trans,:c_head,G);
COMMIT_form;
    MESSAGE('OUT');
          MESSAGE('TRANS ID'||:c_trans);
          MESSAGE('head '||:c_head);
          MESSAGE('gd value '||G);
end if;
if form_success then
     message('You have granted the above request');
else
     message('failed');
end if;
end;That is if i click this submit button the packaged procedure should be invoked and the values passed thru the form should be committed.in order to know the values passed i have given several messages before and after invoking the package.my problem is after this message
MESSAGE('head '||:c_head);  --navigation occurs after this message.*** navigation moves from the current canvas to another canvas.i don have any clue why its happening like this and i want to stop this navigation from current canvas to another one.all canvases in this form are stacked canvas.pls suggest me what i have to do?.

Answer 1

Sorry for such a late reply Hamid.I have tried commenting all code and putting the button only with
null; In such case navigation doesn't occur.then again i tried commenting each set code and i suspect that navigation occurs only in the presence of "COMMIT" statement.
declare
g char(1);
begin
     --     message('value is '||:gd_ind);
/*     if :gd_ind is not null then
     if :gd_ind = 'Y' then
          G:='Y';
     ELSE
          G:='N';
     end if;
     --     MESSAGE('IN');
     --     MESSAGE('TRANS ID'||:c_trans);
     --     MESSAGE('head '||:c_head);
          --MESSAGE('gd value '||G);
Leave_application.grant_or_deny_leave(:c_trans,:c_head,G);*/
COMMIT;
/*   -- MESSAGE('OUT');
     --     MESSAGE('TRANS ID'||:c_trans);
     --     MESSAGE('head '||:c_head);
     --     MESSAGE('gd value '||G);
--end if;*/
end;Does this COMMIT statement have any impact on the navigation?.Do u have any idea Hamid.