I don't have access to my docs right now, otherwise I would have specified the bit, but JFCVSL sounds correct. It needs to be set on any OPEN when there is a changed data set name or serial. I seem to recall setting it for a changed member name also.
I've tried setting the JFCBVSL flag before I open a volume with the JFCBVLSQ field set, but it doesn't seem to make any difference. Do you have a documentation reference for that?
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