InterfaceSource value is based on what option you have selected: Interface Name or Port or MAC Address under PXE Boot device
For Interface Name, the value is "name"
For Port, the value is "port"
For MAC Address, the value is "mac"
For PXE Boot, you need to add the following under BootDevices:
{
"Name": "demo",
"IpType": "IPv4",
"Slot": "MLOM",
"InterfaceName": "eth0",
"Enabled": true,
"ObjectType":...
Native VLAN is a mandatory field under the Ethernet Network Group Policy. Valid Value Range: 1-4093 and it defaults to 1 if we don't specify a Native VLAN.