>>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?
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>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?

I use TASTRADE kind of NEWID to assign primary key (surrogated key). After APPEND BLANK in the master table, I use INSERT (key) VALUES (key) where key is the value obtained from master table. In grid, I use REPLACE key WITH master.key. I can't find any REPLACE ALL/FOR command in my form but I certainly have DELETE FOR EMPTY(xxxfield) (details table) before I do tableupdate. Do you think it matters?