>I have been tormented by this message for months. When two or more users start to use my invoice form, I get this error. I am on optimistic buffering mode (master - record buffering, detail - table buffering in grid). It happens occasionally when a user finishes one invoice (tableupdated) and is half way through the second invoice entry while another user is doing the same stuff.
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>Anyone can suggest the possible cause of this problem?

How do you add records to the table? How do you assign primary keys? Does your code contain any REPLACE FOR or REPLACE ALL statements?