You got lucky.
Sequential files are by their nature multiple read but single write operations. This is not a 'DataStage thing'. More than likely you won't get any kind of error but the output would be... unpredictable... at best. Junk at worst case.
Use a larger data set. Run the job more than once. Unless you ensure that only one process is writing to the file at any given time - you will have problems.
How to split a single row of record in to two row of output
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