Just to put this to bed ... APAR PK20643 is open. I've recently been asked to check out a couple of, "sample" ICKDSF modules with a new, "CPVOL REFVTOC" function in - and this appears to do the trick. The new version is much better behaved wher e read-only functions such as, "CPVOL LIST" are concerned.
I suspect that PK20643 will close soon so, if you're eager to get your hands on the latest and greatest ICKDSF, I guess it's time to get on the Interested Parties list. Another one bites the dust ... :-)
