PurchaseOrder

{
	"ID": "",
	"RefNumber": "",
	"DueDate": "2019-07-23T00:00:00.0000000-05:00",
	"TxnDate": "2019-07-23T00:00:00.0000000-05:00",
	"TotalAmount": 0.0,
	"IsOpen": false,
	"VendorAddress": {
		"Addr1": "",
		"Addr2": "",
		"Addr3": "",
		"Addr4": "",
		"Addr5": "",
		"City": "",
		"State": "",
		"PostalCode": "",
		"Country": ""
	},
	"ShipAddress": {
		"Addr1": "",
		"Addr2": "",
		"Addr3": "",
		"Addr4": "",
		"Addr5": "",
		"City": "",
		"State": "",
		"PostalCode": "",
		"Country": ""
	},
	"Vendor": {
		"ID": "",
		"Name": "",
		"FullName": ""
	},
	"LineItems": [{
    "ID": "",
		"Customer": {
			"ID": "",
			"FullName": ""
		},
		"Item": {
			"ID": "",
			"FullName": ""
		},
		"Quantity": 0.0,
		"Rate": 0.0,
		"Class": "",
		"Description": "",
		"Amount": 0.0
	}],
	"Terms": {
		"ID": "",
		"FullName": ""
	},
	"Memo": ""
}

Purchase Order Lines may be referenced in some supported transactions. To reference the PO.ID and PO.LineItem[].ID will need to be used.