On Thu, 17 Nov 2016 12:35:46 -0600, Paul Gilmartin wrote:

>o APPLY REDO doesn't always undo the side effects of the prior APPLY.
>  I suspect this is particularly true if the SYSMOD contains ++*UPD or
>  ++ZAP or if the newer version contains fewer CSECTs than the
>  previous and this is what I misremember as "can't RESTORE".

Do you mean, for example, if your PTF included elements A and B, and 
the updated PTF includes only element A, that the updates from B for 
the original PTF are still there? Or if the original PTF put element C into 
target library X and the updated one put C into target library Y? This is 
not a surprise to me. It is the kind of reason that I don't like to modify 
a PTF and reapply it with REDO. In fact, I don't like to modify a PTF. In 
some cases we will do so, but ONLY IF WE ARE CERTAIN that the PTF 
has not been shipped to any customer.

Tom's rule number 1 about creating PTFs: Don't change the PTF!
Tom's rule number 2: If you think it is ok to change the PTF this time, 
refer to rule 1.
Tom's rule number 3: If you do change the PTF, despite the first two 
rules, then RESTORE and REJECT it, then RECEIVE and APPLY, and 
check all possible permutations.

-- 
Tom Marchant

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