To answer Jake's original question, CBU can be deactivated at any time by
command (either in z/OS, on HMC/SE, or by API, depending on your hardware
model).  That stops the licensing accrual for CBU (as well as limiting the
MSU back to non-CBU value).  Several ways to do it, the simplest is to vary
offline the CPs that were activated by the CBU (which could be more than
general purpose processors).  z/OS is smart enough to then stop the CBU
record (mark it inactive).
Undoing any charges for the accidental CBU period is a manual process to be
discussed with your IBM rep, but showing good faith by using the commands
to undo the CBU, rather than continuing to run with the increased MSU
capacity, is probably a factor in value discussions.  Note SCRT reports for
that month will also pick up on the extra MSU as they are used, which may
affect non-IBM software pricing.

On Sat, Dec 4, 2021 at 11:42 PM Jake Anderson <justmainfra...@gmail.com>
wrote:

> Hello
>
> Is it possible to swtich back to temporary CBU activation incase it someone
> has activated the CBU permanently by mistake ?
>
> Jake
>
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