>>My guess would be that the updates don't get written back to the table. Make sure you FLUSH the data. Take a look at the article on Primary Keys on my web site.
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>UNLOCK automatically flushes the buffers.
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>BOb

This is right, but this is only as far as FoxPro is concerned. The data are passed to the operating system and from FoxPro point of view they are updated, but they are not actually written to the disk yet, They travel by wires to the NT server, stay for some time in NT Server buffers and/or in NT Server hardware cache. This seems to be enough to get the duplcates. (I had this problem with a big FPD 2.5 app). It seems the best way here is to provide the real unique id keys system.

Nick