How to update model only if value has changed?

I would have expected that a model property is only updated if the value of the UIComponent has changed, but I am apparently wrong.
Why is the setter-Method of a model always called, even if the old and new value are the same (or better: equal)?
I have not found anything in the spec that defines the behaviour of an implementation in this regard.
thanks in advance for any comments
Daniel

I think the value always gets set, why? Does it cause problems on your end?
Though, it will be better if they don't update it when they are the same values.

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    I need to add a condition based if the valve of :P1_fred has changed.
    My currect way at the monument is to record the value after the Automated Row Fetch to :p1_fred1
    Then compair :P1_fred to :P1_fred1 and before the coniition before Automatic Row Processing
    Whiile this works, is there a simple way of doing this?
    Thanks
    Pete

    Hi Pete,
    I never do "By Reference" (or OUT) for parameters - I tend to create functions instead of procedures and do:
    SELECT check_file_one(:new.key) into status1 FROM DUAL;or something similar.
    From what I can see of the create procedure guide, you can use as many OUT parameters as you like: http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_6009.htm#sthref7098
    The only time I've seen anything similar is when one process has terminated and cleared out the variables. But this was when I'd have / or GO in the procedure itself.
    What happens if you create a second variable for status1 (say, status1copy) and set this as "status1copy := status1" immediately before the second procedure call - does status1copy retain its value?
    Andy

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