Let us not forget one of the fun cases:  exit code which exists, but because of 
external circumstances, is ineffective:  for example account number checking 
when the idea of chargeback has been dropped and the check now allows anyone to 
use any code, or an exit which uses RACF to check on something and the profile 
has been changed so that UACC allows everyone to pass.   So your exit is 
invoked, MAY not be needed, but requires further work to check.

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