On FleetCheck, you might have several vehicles that you need to amend the VOR dates on but the system is preventing this. If this is happening it is possibly due to the fact that the Earned Recognition default settings are turned on -
If you have Enforce Earned Recognition Default settings selected the VOR cannot be backdated by more than a week. Simply untick this setting and adjust your VOR as required.
If you are doing this please be aware that this will effect your Earned Recognition scoring - we would suggest talking to the DVSA for clarification on this matter.