After migration from Z13 to Z15, found the following messages:
Using the STATUS command in Sysview :
JES2 2.3 (service level mismatch, expected 5 found 4)
Using the LISTLOG command in Sysview :
GSV3717I Checking for JES configuration module GSVBJ235
GSV3718I Configuration module for JES2 2.3 service level 5 not found
GSV3717I Checking for JES configuration module GSVBJ234
GSV3774I Using JES configuration module GSVBJ234, service level 4
Release : 15.0
Release : 16.0
Component : SYSVIEW
The maintenance to support JES2 Service level 5 is not applied.