It is fine with z/OS itself if you use the same field for both the input 
token and the updated token.
Whether it works for you will depend on whether you care. Maybe your 
recovery looks at something that wants to know if you still have the old 
token vs the updated one.

The functionality of IEAVPSE (and the other similar "pause" targets, but 
not "multi-pause" IEAVPME2 / IEA4PME2):
-- does a LM of the token into registers while running in your state and 
key
-- PC's to change state (where the target uses the registers 
   and never looks at the parameter list)
-- does a LM into registers of the updated token
-- PR's back to your state and key
-- STM's to your updated-token 

Peter Relson
z/OS Core Technology Design


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