In a recent note, Tom Marchant said:

> Date:         Mon, 6 Nov 2006 12:07:15 -0600
> 
> Suppose PTF X includes modules A and B.  It becomes PE.  The code
> in B is ok, but the code in A needs to be replaced.  The vendor
> then has two choices.  Either SUP X with a PTF Y containing A and
> B or provide a PTF containing just A with a PRE to pick up B.
> 
Suppose a more extreme case.  The vendor has previously issued
PTF W, which added new function in module C.  Subsequently, the
vendor issues PTF X, containing updated modules A and B, which
newly exploit the function introduced by PTF W.  But the vendor
fails to declare the dependency on W, and a customer who APPLYs
X but not W reports a problem.  The vendor can repair this
simply by issuing "++ HOLD (X) ERROR REASON(W) ...

There is no commonality of elements.  Can a customer then cause
a malign regression by RESTOREing W but not X?  TFM appears not
to prohibit this, despite the ++HOLD.  I asked about this in:

   http://bama.ua.edu/cgi-bin/wa?A2=ind0610&L=ibm-main&P=150582

but received no definitive answer, possibly because Shane asked
Kurt not to reply.

-- gil
-- 
StorageTek
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