Your help on this is much appreciated. I have made a customized data collection system in ArcPad. I have a number of people collecting data each day. All there data is checked-in each evening and the following day they continue collecting data into their working AXF. Each data point has a unique sample number. All is working fine until the check-in process. The check-in is only supposed to import unique points, correct? How come every check-in checks-in every sample ever collected whcih means that samples are being duplicated, triplicated, etc. every time I run a check in? How do I stop the check-in from importing duplicates?