Accessing Data Members after using expand in Odata - odata

Question

I currently have an odata service with 2 entity sets. I am using expand to navigate to second entity set, and binding values from both in a table.
However, I am unable to bind data from second entity set as {to_PurchaseOrderItem/PurchaseOrderQuantityUnit}
Am I doing this wrong?
The JSON reply looks something like this, so I am really confused what I am doing wrong.
"d": {
"results": [
{
"PurchaseOrder": "4500000001",
"Language": "EN",
"PaymentTerms": "0004",
"CashDiscount1Days": "0",
"CashDiscount2Days": "0",
"NetPaymentDays": "0",
"CashDiscount1Percent": "0.000",
"CashDiscount2Percent": "0.000",
"PurchasingOrganization": "1710",
"PurchasingDocumentOrigin": "9",
"PurchasingGroup": "001",
"CompanyCode": "1710",
"PurchaseOrderDate": "/Date(1468454400000)/",
"DocumentCurrency": "USD",
"ExchangeRate": "1.00000",
"ValidityStartDate": null,
"ValidityEndDate": null,
"SupplierQuotationExternalID": "",
"SupplierRespSalesPersonName": "",
"SupplierPhoneNumber": "",
"SupplyingSupplier": "",
"SupplyingPlant": "",
"PurchaseOrderType": "NB",
"IncotermsClassification": "",
"InvoicingParty": "17300001",
"ReleaseIsNotCompleted": false,
"PurchasingCompletenessStatus": false,
"IncotermsVersion": "",
"IncotermsLocation1": "",
"IncotermsLocation2": "",
"ManualSupplierAddressID": "",
"AddressCityName": "",
"AddressFaxNumber": "",
"PurchasingDocumentDeletionCode": "",
"AddressHouseNumber": "",
"AddressName": "",
"AddressPostalCode": "",
"AddressStreetName": "",
"AddressPhoneNumber": "",
"AddressRegion": "",
"AddressCountry": "",
"AddressCorrespondenceLanguage": "",
"PurchasingProcessingStatus": "02",
"CreatedByUser": "CB9980000025",
"CreationDate": "/Date(1468454400000)/",
"Supplier": "17300001",
"PurchaseOrderSubtype": "",
"to_PurchaseOrderItem": {
"results": [
{
"PurchaseOrder": "4500000001",
"OrderQuantity": "100",
"PurchaseOrderQuantityUnit": "ES",
"OrderPriceUnit": "ES",
"OrderPriceUnitToOrderUnitNmrtr": "1",
"OrdPriceUnitToOrderUnitDnmntr": "1",
"NetPriceAmount": "0.21",
"DocumentCurrency": "USD",
"NetPriceQuantity": "1",
"TaxCode": "",
"PriceIsToBePrinted": true,
"PurchaseOrderItem": "1",
"OverdelivTolrtdLmtRatioInPct": "10.0",
"UnlimitedOverdeliveryIsAllowed": false,
"UnderdelivTolrtdLmtRatioInPct": "10.0",
"ValuationType": "",
"IsCompletelyDelivered": false,
"IsFinallyInvoiced": false,
"PurchaseOrderItemCategory": "0",
"AccountAssignmentCategory": "",
"MultipleAcctAssgmtDistribution": "",
"PartialInvoiceDistribution": "",
"PurchasingDocumentDeletionCode": "L",
"GoodsReceiptIsExpected": true,
"GoodsReceiptIsNonValuated": false,
"InvoiceIsExpected": true,
"InvoiceIsGoodsReceiptBased": false,
"PurchaseContract": "",
"PurchaseContractItem": "0",
"Customer": "",
"ItemNetWeight": "0.000",
"ItemWeightUnit": "",
"TaxJurisdiction": "0508525201",
"PurchaseOrderItemText": "RAW15,PD",
"PricingDateControl": "",
"ItemVolume": "0.000",
"ItemVolumeUnit": "",
"SupplierConfirmationControlKey": "",
"IncotermsClassification": "EXW",
"IncotermsTransferLocation": "VENDOR",
"EvaldRcptSettlmtIsAllowed": false,
"PurchaseRequisition": "",
"PurchaseRequisitionItem": "0",
"IsReturnsItem": false,
"Plant": "1710",
"RequisitionerName": "",
"ServicePackage": "0",
"EarmarkedFunds": "",
"EarmarkedFundsItem": "0",
"IncotermsLocation1": "VENDOR",
"IncotermsLocation2": "",
"Material": "RM15",
"ManufacturerMaterial": "RM15",
"ServicePerformer": "",
"ProductType": "1",
"StorageLocation": "",
"DeliveryAddressID": "",
"DeliveryAddressName": "",
"DeliveryAddressStreetName": "",
"DeliveryAddressHouseNumber": "",
"DeliveryAddressCityName": "",
"DeliveryAddressPostalCode": "",
"DeliveryAddressRegion": "",
"DeliveryAddressCountry": "",
"MaterialGroup": "L002",
"PurchasingInfoRecord": "5300000201",
"SupplierMaterialNumber": ""
I am trying to access Order Quantity to be specific.
Thanks!

Answer 1

I think you are missing "results" while binding the control. Please see below and try
{to_PurchaseOrderItem/results/0/PurchaseOrderQuantityUnit}