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This is an MVS message indicating that a duplicate catalog
entry exists. E.g., if you already have a dataset with dsn =
'xxxx.yyyy' and u try to create one with disp new, catlg,
you would get this error. the program open and write would
go through and at the end of the step the system would try
to put it in the system catalog. at this point since an
entry already exists the catlg would fail and give this
message. you can fix the problem by deleting/uncataloging
the first data set and going to the volume where the new
dataset exists(this info is in the msglog of the job) and
cataloging it.
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