This holds the numeric error code returned by a fabric interconnect (or other remote endpoint) if a remote step of this object's state machine failed. Deleting a QoS definition isn't instantaneous — UCS Manager has to unwind every reference to it on every fabric interconnect and adapter that used it, and this task object is what tracks that cleanup to completion. A value of 0 means the most recent remote invocation succeeded; a nonzero code paired with the sibling error-description field is what an admin would quote when opening a TAC case about a QoS policy that won't apply.