Unable to delete an Orphaned Checkpoint

Hi,

I have a SCVMM 2012 R2 instance with 3 hosts

I recently moved a VM between the hosts which failed. Having tidied up I was left with a bunch of checkpoints on the VM, which I removed via the SCVMM GUI

The VM shows that it has no checkpoints (which is good), however some other objects within SCVMM (Namely VM Networks) show the checkpoints as dependencies, meaning I can't delete the VM Network.

If I run get-scvmcheckpoint from powershell I'm returned 4 checkpoints, none of which have an associated VM

(output from most recent below)

ParentCheckpointID    : 87F48F7D-AD2A-49BB-8E0A-F981317ABF2C
CheckpointID          : 20396B70-57A7-4CFD-9D3A-656F22F7A7BF
VMId                  : 3d7da10d-8f22-44a0-bc31-4202244b857a
IsViewOnly            : False
CheckpointHWProfile   : Microsoft.SystemCenter.VirtualMachineManager.Checkpoint
                        HardwareProfile
VirtualDiskDrives     : {VMMQSM1}
VM                    :
ObjectType            : VMSnapshot
Accessibility         : Public
Name                  : VMMQSM1
Description           : Temp QSM data
AddedTime             : 03/02/2014 09:59:09
ModifiedTime          : 03/02/2014 11:01:53
Enabled               : True
MostRecentTask        :
ServerConnection      : Microsoft.SystemCenter.VirtualMachineManager.Remoting.S
                        erverConnection
ID                    : d1ebf759-0f17-4245-bf9f-ea7abe886ef0
MarkedForDeletion     : False
IsFullyCached         : True
MostRecentTaskIfLocal :

And If I try get-scvmcheckpoint | remove-scvmcheckpoint I'm just returned an error:

VMM cannot find a required object. (Error ID: 20404)

Ensure the object is valid, and then try the operation again.

Is there any way for me to remove these orphaned checkpoints?

Phil