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Can't override a default value of a text box function

Posted By:      Posted Date: October 15, 2010    Points: 0   Category :SharePoint
I have a text box that calculates the default value based on the values of other fields. I need the ability to override this default value and enter in a static value. The problem is when I enter in my static value and save the form, close it and reopen the form the calculated value shows instead of the static value I entered.

Any idea what might be causing this?

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