Oracle Forms : Accesing previous value of a field

I am designing a form which is master detail in the way it looks. Both the blocks are non-database blocks. On the header part there are 2 fields and a button. Based on the values enterd in these fields, when the button is pressed, it populates the fields in the detail block below which is a multiple item block. Now what ever value is displayed in the detail block is editable. What i want is that what ever value is edited by the user should not be more than the initial number value populated initially in that field. Basically what i want is how do i access that previous value in that field which was there before the user edited that field, so that i can put validation checks with that field.
It would be great if any of u can pls help me. Please reach back in case of any clarifications......... waiting for a reply soo........

hello
either you assign the old/original value to a global variable or hidden item or parameter then refer it to the new item value;
after or on populating value :
global.variable := item_value;
validation :
if item_value (EDITTABLE FILED) != global.variable (OLD VALUE) then
end if;
charles

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Error 103 at line 14
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a PL/SQL variable or double quoted string
an expanded name
an expanded name link
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a key word
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