PLUALMSG start option

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   .-PLUALMSG--=--NOSUPP-------.   
>>-+---------------------------+-------------------------------><
   '-PLUALMSG--=--+-SUPPRESS-+-'   
                  '-NOSUPP---'     

Specifies whether VTAM® is to suppress duplicate session setup failure messages associated with LOGAPPL failures to the same PLU.

You can change the value of PLUALMSG with the MODIFY VTAMOPTS command while VTAM is running.
PLUALMSG=NOSUPP
Specifies that VTAM does not suppress the session setup failure messages.
PLUALMSG=SUPPRESS
Specifies that VTAM suppresses duplicate session setup failure messages.