Abstract: Request definitions associated with respective actions of a workflow identify characteristics of objects utilized in performance of the respective action. Hypothetical in-flight changes that modify the characteristics are anticipated and implemented into the workflow. The actions within the workflow are subscribed to the hypothetical in-flight changes based upon the characteristics identified in the request definitions and modified by the in-flight changes by identifying which in-flight changes affect which workflow actions. Accordingly, when an in-flight is received, the workflow is automatically updated to account for the modifications to the characteristics made by the in-flight change. Specifically, actions that should be undone and/or redone in response to the modification to the characteristics are automatically identified and new tasks are created to undo and/or redo the identified actions.