mmmm... this route looks familiar to me since, in fact, I tried my first backup and then EE edition of DMKRIO (I simply did ACCESS 094 C) ... just to find that the thing does not have any efect per-se, but rather the reassemble procedure was needed.
But still, I guess that doing VMFASM DMKRIO DMKHRC is not 'that easy'... I mean
In order to do VMFASM, I need to do perform an EXEC VMSETUP CP isn'it? Or does DMKHRC look for a DMKRIO ASSEMBLE file at maint's A? In fact, I recall that upon doing the VMSETUP CP command, disk 094 gets 'mounted' (Linux jargon here, sorry, don't know how to call that) on E/F Read/Only... are changes expected therefore to be done on copies at A?