To undo an edit to a resource definition, or even restore a resource definition to a much older version of itself, you select an historical version of the resource definition, and then save it. This copies the historical version of the resource definition, stored in the CICSĀ® Configuration Manager journal, to the current CICS configuration.
On the list of historical versions:
The edit panel for this historical version appears.
The edit panel for the resource definition appears: notice that your earlier edits have been undone.