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a) I don't recall when (if?) IBM provided Row/Column security. If this is available on this system, is it possible that row security is turned on and the one user does not have authority to the 1st record?
b) Are both looking at the same file in the same library? Or is the second user looking at the file via a logical file w/ omit/select? Multi-member file, are both looking at the same member?
c) as philp1jb suggested, can't both retrieve the record at the same time, the system will put a lock on the record.
When you start DFU a page down will take you to the first record (based on the key value) .. how are the users getting to the "first" record