- In the dropdown list under Resources on the ESMAC menu, select 
                  		  By Group. 
                  		
               
- Click 
                  		  Groups, then click 
                  		  Details next to the resource group you want to update. 
                  		
               
- Click 
                  		  JES. 
                  		
               
- Specify 
                  		  IMS MPR in the 
                  		  Type field, the relevant classes in the 
                  		  Classes field, and an appropriate text in the 
                  		  Name and 
                  		  Description fields. 
                  		
               
- Click 
                  		  Add. 
                  		
               
- Click 
                  		  Group List. 
                  		
               
Note: You can specify a maximum of four classes in the 
               		Transaction Class field. You must separate each class by a comma. The classes you specify must be less than 32-bytes long. If you specify more
               than four classes only the first four are used. When you start the enterprise server instance you see a message (CASIP0013I)
               in the 
               		console.log that shows which classes have been registered for use. 
               	 
            
            	 
            Note:  
               		
               Defining a message processing reigon for an enterprise server in this way causes a message processing region to start each
                  time the enterprise server is started. For information on creating a message processing region that only exists until an enterprise
                  server stops, see the section 
                  		  Temporary MPRs in the chapter 
                  		  Administering IMS-enabled Enterprise Servers in your Mainframe Subsystem Support Configuration and Administration Guide.