I have a calculated field that gets one half of the formula for its calculation from an auto populated field on my form, and duplicate data, such as my part number, and the other 5 fields I have populating based on the part number entry do not save twice. My Efficiency field is not saving to tblRipForm like it is supposed to, all other information that is not a duplicate saves just fine, but I need this calculated field to save, as it is reported by a start date and end date. The database is for an Automotive parts manufacturer, and they need the shift efficiency stored for each shift/part number/daily. Any ideas as to what might be wrong, is it a bug in Access 2010????