export-VApp : dVs issue in OVF descriptor ??

Hi,

Trying to export a VMware vCenter Operations Manager (v5.6) from a vCenter v5.0.0 to a folder, to import later in a new vCenter environment (v5.1).

Just played with the export-VApp cmdlet but got following error:

Export-VApp : 3/29/2013 1:49:38 PM    Export-VApp        Failed to retrieve OVF descriptor for the export operation with the following errors: One or more properties are refering to an unknown network 'dvPortGroup 062'.

At line:1 char:69
+ get-Vapp -Name "VMware vCenter Operations Manager 5.6" | Export-VApp <<<<  -D
estination "z:\VMware\backup\" -Format Ova -Force
    + CategoryInfo          : NotSpecified: (VirtualApp-resgroup-v742:ManagedO
   bjectReference) [Export-VApp], ViError
    + FullyQualifiedErrorId : ViCore_VappServiceImpl_ExportVApp_ExportSpecFail
   ed,VMware.VimAutomation.ViCore.Cmdlets.Commands.ExportVApp

Here's my script :

get-Vapp -Name "VMware vCenter Operations Manager 5.6" | Export-VApp -Destination "z:\VMware\backup\" -Format Ova -Force

Just to precise that this vApp containing 2 VMs (vCops UI VM & Analytics) is powered off, running well and bound to a dVS and dVportGroup well configured.

Any idea? thanks by advance