Master-Detail Foms,Update after Execute-Query

Hi All,

I have a master-detail form.These are the below issues.

1) When I want to display data in both master and detail form, I have a query button and I have written a trigger inside it. The trigger has a the below code.

IF :SYSTEM.RECORD_STATUS IN ('INSERT','CHANGED','QUERY') THEN
CLEAR_FORM(No_Validate);
ENTER_QUERY;
ELSIF :SYSTEM.RECORD_STATUS IN ('NEW') THEN
EXECUTE_QUERY;
END IF;

And this code works fine,But when I try to update the data fetched from the Execute Query.My Update statment does not work.Not only my Update statement,None of my DML statements seems to work.