VSS snapshots for DPM 2010 Hyper-V backup conflict with SQL backup on a virtual SQL server

We currently use DPM 2010 to backup our virtual servers which reside on a 5 node Hyper-V clustered share volume. DPM uses the hardware VSS writer to backup the Hyper-V guests. Several of these Hyper-V guests are SQL servers (SQL 2008) and they
are all configured to run point in time SQL backups using SQL Management Plans.
The SQL backups are scheduled to run a full database backup on a Friday and differential backups on the other days of the week. Transaction backups are scheduled to run several times throughout the day.
However we have recently discovered that there is a conflict between these two methods as it seems as though when a restore is required using a differential SQL backup, it fails as the snapshot created by DPM forces SQL to believe it has had a full backup
carried out externally from the Management Plan and is therefore unable to perform the restore.
DPM backs up the Hyper-V guests on a daily basis from 8pm.
Can anyone provide any advice or guidance on this as we need both types of backup to run successfully. We are required to backup SQL with point in time backups and we also need to protect the Hyper-V guests in their entirety.

Thanks Mike,
I have tried this but unfortunately it has no effect. The VM has Oracle installed (although not the Oracle VSS Writer). It is the Oracle application server, not the database server, and the customer has a script that is used to stop and start
the Oracle application when required. Through troubleshooting this with them I have noticed that after the WLS_Reports service/process is stopped the backups run successfully but when it is running the backups fail.
I have also noticed that when I stop the Hyper-V Volume Shadow Copy Requestor the backup runs successfully, which I guess is as expected.
When the backups fail I get 2 errors in the application log:
Event Id 12293, VSS - Error calling a routine on a shadow copy provider {GUID for the Hyper-V IC Software Shadow Copy Provider}. Routine details PreFinalCommitSnapshots ({GUID}, 5) [hr = 0x800705b4, This operation returned because
the timeout period expired.]
Event Id 19, vmicvss - Not all the shadow volumes arrived in the guest operating system.
This is also part of the same problem I have posted here: Backup
fails for a Hyper-V guest with VSS Writer failures using DPM 2012 R2 - Hyper-V guest has Oracle application installed
Regards
Chris

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