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Does ArcPad support Null values?
No, ArcPad does not support NULL values. The issue arises with the DBF tables associated with the data. The concept of NULL does not exist in a DBF. It is recommend that the user update their database design to model NULL values in a different way that ArcPad supports. For example, say the field is DISTANCE. You can introduce a CHAR (1) field called DISTANCE_NULL which is set to be ‘Y’ or ‘N’.