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1.  It shall be possible to move the start time of a reservation.

   1. It shall be possible to push the start time into the future.

      1. The request should be allowed only if the reservation is empty.
      2. The request should be allowed only if the reservation has not already started.

   2. It shall be possible to move the start time of a confirmed reservation sooner if resources are available.

2. It shall be possible to extend the end time of a reservation.

   1. If the new end time would interfere with an existing high priority calendared event (i.e. another reservation or dedicated time) the request shall fail.

3. It shall be possible to move forward the end time of a reservation so that it ends sooner.
4. While changing the times of a reservation, if the reconfirmation on the same nodes fails, PBS should consider other nodes (vnodes) for reconfirmation.
5. A new CLI viz. pbs_ralter to be provided so alter the reservation.

6. The new capabilities should be applicable on advance reservations.

7. The new capabilities should be applicable on standing reservations.

   1. The instances of the standing reservation that need to be modifiable are the current and next one.

8. A scheduling cycle should also be triggered by the end of an advance reservation.

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