There are significant structural changes to Application Worklflow Manager (AWM) and to z/Server in Enterprise Developer 2.3.
As a result, AWM in Enterprise Developer 2.3 does not reliably support earlier versions of z/Server. If you have an existing installation of z/Server, Micro Focus recommends that you upgrade it to z/Server 2.3 (V2R3) to ensure all functionality works as expected.
See Installing z/Server as an Upgrade and Backward Compatibility of AWM Models for more information.