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Roger:

Perhaps someone forgot to specify "*LOCK" on the IN statement, so you could have something like this example:

D DataArea DS DtaAra(NextNumber)
D NextNbr 15P 0 INZ
...
C IN DataArea
C ADD 1 NextNbr
C OUT DataArea
C MOVE NextNbr Result

and thus, no protection from multiple jobs simultaneously accessing and updating that data area. This will compile and run "just fine" and it might even seem to "work" okay most of the time, but,when two jobs run this code at the same time, you could experience exactly the issue you reported.

What is needed is:

C *LOCK IN DataArea
C ADD 1 NextNbr
C OUT DataArea
C MOVE NextNbr Result

Hope that helps...

Mark S. Waterbury

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