Cannot configure RHEV-M network for new RHEV-H hypervisor via admin portal

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Issue

Cannot configure the RHEV-M logical network for a new RHEV-H hypervisor via the Admin Portal.
Possible errors of "interface already in use" when trying to assign the RHEV-M network

Environment

Red Hat Enterprise Virtualization 3.3
RHEV-H hypervisors
RHEV-M logical network is vlan tagged

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