> OPEN for UPDAT might require the GET LOCATE instead of GET MOVE.

Yes. See the FM "DFSMS Macro Instructions for Data Sets"
UPDAT
Data set to be updated in place or, for BDAM, blocks are to be updated or 
added. If you specify UPDAT using QSAM, you must use locate mode.
Restriction: The UPDAT option is not allowed for compressed format data sets, 
or UNIX files, or for magnetic tapes, or with large block interface.



--
Peter Hunkeler





--
Peter Hunkeler

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