This article provides the necessary documentation links and steps for upgrading IPC from version 15.0 to 15.1, including prerequisites and post-installation requirements for CICS.
To upgrade to IPC 15.1, follow these steps:
PRINT SCREEN command for SET COMMAND SITE (SCF#OPTIONS) and SET OUT SITE (PSS#OPTIONS). The upgrade resets these to defaults.See the documentation : Customization and Postinstallation Steps for IPC