VE backup and Oracle - Writer 'Microsoft Hyper-V VSS Writer' failed


We have a Cell Manager in a Windows Server 2012 R2 with Data Protector 9.07 installed. Cell Manager is also the Backup Host for the VE integration.

We have some virtual machines (hyper-v) that we want to backup using the VE integration. In some of them we have oracle forms and reports server cluster installed and when we try to back them up we get the following error:

[Normal] From: "HyperV"  Time: 1/4/2018 8:31:43 πμ
 Volume Shadow Copies successfully created.

[Normal] From: "HyperV"  Time: 1/4/2018 8:31:43 πμ
 Exiting Shadow Copy Set creation phase.

[Major] From: "HyperV"  Time: 1/4/2018 8:31:44 πμ
[145:575]  Writer 'Microsoft Hyper-V VSS Writer' failed to prepare files for backup:

[Major] From: "HyperV"  Time: 1/4/2018 8:31:44 πμ
 Cannot perform backup of:
  '/Microsoft Hyper-V VSS Writer/Virtual Machines/Online\APPL26',
 which contains data in:
  C:\ClusterStorage\volume1\hyper-v\appl26\Virtual Machines\ED770C97-4775-4AFA-A64C-91DFDF7D9D5F.xml
  C:\ClusterStorage\volume1\hyper-v\appl26\Virtual Hard Disks\APPL26_C.VHDX
  C:\ClusterStorage\volume1\hyper-v\appl26\Virtual Hard Disks\APPL26_D.VHDX
  C:\ClusterStorage\volume1\hyper-v\appl26\Virtual Hard Disks\APPL26_C-AutoRecovery.avhdx
  C:\ClusterStorage\volume1\hyper-v\appl26\Virtual Hard Disks\APPL26_D-AutoRecovery.avhdx

[Major] From: "HyperV"  Time: 1/4/2018 8:31:44 πμ
 There is no data to be backed up.

[Major] From: "HyperV"  Time: 1/4/2018 8:32:20 πμ
 Backup failed.

[Normal] From: "HyperV"  Time: 1/4/2018 8:32:22 πμ
 Deleting Volume Shadow Copies and releasing the volumes.

[Major] From: VEPALIB_HYPERV@dpsrv01 "HyperV"  Time: 1/4/2018 8:32:19 πμ
 VSS Agent finished with errors.


Cell Manager/Backup Host: dpsrv01 (Windows Server 2012 R2)

Physical server: hyper11 (Windows Server 2012 R2)

VM: efkaappl26 (Windows Server 2008 R2)


If we stop the oracle services, VSS has no problem and the backup runs without errors.

Does anyone have any idea on what to do?