Action Codes: A=Add D=Delete X=XREF /=Menu Bar
There is no S=Select, because you are not actively working on any scheduling environment (and therefore there is no place for you to select resources to).
There is a D=Delete action code. This will be important when you are deleting resources, as in Deleting a resource.
Selection For Scheduling Environment DB2LATE
Action Codes: A=Add S=Select X=XREF /=Menu Bar
The name of scheduling environment that you are currently working with appears on this panel, and there is a S=Select among the action codes. You can select the new resource to be a part of the scheduling environment immediately after creating it.
There is no D=Delete action code, because you cannot delete resources when you come the Resource Definition List panel this way. See Deleting a resource.