You cannot install a REQUESTMODEL definition which has identical pattern-matching options (CORBASERVER, TYPE, EJB, CORBA, and COMMON attributes) as an installed REQUESTMODEL with a different name. If you try, the install is rejected and a message is written to either the console or user's terminal indicating the name of the conflicting REQUESTMODEL.
You cannot install a request model with CICS® Transaction Server for OS/390®, Version 1 Release 3 attribute values in a CICS Transaction Server for z/OS®, Version 2 Release 1 or later system.