Task deletion through XOG has a prefix ~dtp for Task ID

Document ID : KB000115355
Last Modified Date : 19/09/2018
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When a Task is deleted through XOG the Task ID has a prefix ~dtp. Why?
When the task is deleted via XOG or deleted in OWB or MSP the Task ID will have the prefix ~dtp. 
When the task is deleted in the UI the Task ID won't have the prefix ~dtp. 
That is by design and the reason is to distinguish how the task was deleted.