Putting Back a Task 
When you are assigned to a certain task or when someone delegates a task to you, it appears in your task list in the Universal Worklist (UWL). If you do not have the resources to complete the task assigned to you, or if you feel uncomfortable about performing it or simply cannot do it, you can put back the task.
If you open a task in the UWL you automatically become the processor. If you picked up a task by mistake or you cannot accomplish the task for any reason, you can put the task back into the pool. After you put back the task, you are not the task's responsible owner anymore. All potential owners of the task can see the task again in their inbox (UWL).
To put back a task, in the Actions menu of the task execution UI, choose Put back. The task is put back and the task execution UI is closed.