Unable to save network configuration of RHEL Hypervisors

Issue

• the RHEV GUI is reporting some of the logical networks as being "not synchronized".
• When I try to save the network settings in the RHEV GUI, I see the following error message:
  Cannot setup Networks: The following Network Interfaces can have only a single VM Logical Network, or at most one non-VM Logical Network and/or several VLAN Logical Networks: bond0
• If I open the logical network from the "Data centers" tab, networks in question have no VLAN tagging enabled.
• The other networks do have VLAN tagging enabled too, but show up correctly in the GUI and on the host.