You are mistaken if you believe a field with an amount or text can be updated after writing in it via either the 'Calculate on Exit' property or via a general VBA .Fields.Update method. If someone can write in a Field, it cannot be dependent on any other field. In any event, as I already said:
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other events, such as printing or previewing the document can also trigger updates
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This applies to auto-updating fields, such as DATE fields and to fields of any kind that reference other fields or document properties.
If your concern is to prevent a field that has already had some kind of user input from being edited, all you need do is change its type property to a 'Calculation' field.