How to update CheckBox value change in report in DB table

Hi;
I have created a tabular form & added a check box in my Select statment...also i created a procedure On Submit to update my table according to the checkbox values..
My problem is that the update statment is updating the whole records in the form not only the changes which i done
Any one can give me the key for the update statment?
Regards;
Ehammad

Did any one tried to implement the same example of dkubicek?!! i tried to do the same code but i have problem (f011) should be identified!!!
does any1 have any idea about kind of this error?
Regards;

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    >
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