How to create entry for 2 or more entity sets via OdataModel.create in UI5 - odata

Question

I have a Odata service with 4 entity types - Address, CC, Header, Item, Comments.
After the user presses the "Order" button, I want to create an entry in backend using this service. There is a header and associated items that I need to pass.
oData Service from backend:
{
"d" : {
"__metadata" : {
"id" : "http://.../sap/opu/odata/sap/ZOrders/HeaderSet('3898')",
"uri" : "http://.../sap/opu/odata/sap/ZOrders/HeaderSet('3898')",
"type" : "ZOrder.Header"
},
"CompanyID" : "W",
"StockRoomID" : "A",
"SalesDocument" : "3898",
"ItemSet" : [
{
"__metadata" : {
"id" : "http://.../sap/opu/odata/sap/ZOrders/ItemSet(SalesDocument='3898',SalesDocumentItem='000010')",
"uri" : "http://.../sap/opu/odata/sap/ZOrders/ItemSet(SalesDocument='3898',SalesDocumentItem='000010')",
"type" : "ZOrders.Item"
},
"SalesDocument" : "3898",
"SalesDocumentItem" : "000010", //Line item number
"StockRoomID" : "A",
}
]
}
}
Controller.js
buttonClick: function(event) {
var sServiceURl = this.getOwnerComponent().getMetadata().getManifestEntry("sap.app").dataSources["ZOrders"].uri;
this.OdataModel = new sap.ui.model.odata.v2.ODataModel(sServiceURl);
var model = vc.getView().getModel();
var oEntry = {};
oEntry.CompanyID = model.getProperty("/CompanyID");
oEntry.StockRoomID = model.getProperty("/StockRoomID");
oEntry.SalesDocument = model.getProperty("/SalesDocument");
//Now want to pass items data to service so
//Creating an empty ItemSet array, pulling data from model.
//But my logic is wrong here for sure.
var itemData = [];
var itemsArray = v.getProperty("/ItemSet");
for (var i = 0; i < itemsArray.results.length; i++) {
itemData.push({
SalesDocument: itemsArray.results[i].SalesDocument,
SalesDocumentItem: itemsArray.results[i].SalesDocumentItem,
StockRoomID: itemsArray.results[i].StockRoomID,
});
}
oEntry.ItemSet = itemData;
this.OdataModel.create("/HeaderSet", oEntry, this._submitOrderSuccess.bind(this), this._submitOrderError.bind(this));
**Debugger - Header payload **
{
"CompanyID":"RSW0",
"StockRoomID":"A200",
"SalesDocument":"4053",
"Return":"X",
"Reason":"101",
"ItemSet":[
{
"SalesDocument":"4053",
"SalesDocumentItem":"000010",
"StockRoomID":"A200",
"ReturnItemFlag":"X",
"QtyToReturn":"1.000"
},
{
"SalesDocument":"4053",
"SalesDocumentItem":"000020",
"StockRoomID":"A200",
"ReturnItemFlag":"X",
"QtyToReturn":"1.000"
},
{
"SalesDocument":"4053",
"SalesDocumentItem":"000030",
"StockRoomID":"A200",
"ReturnItemFlag":"X",
"QtyToReturn":"1.000"
}
]
}
**Debugger - Response **
{
"d":{
"__metadata":{
"id":"https://.../sap/opu/odata/sap/ZORDER/HeaderSet('60000353')",
"uri":"https://.../sap/opu/odata/sap/ZORDER/HeaderSet('60000353')",
"type":"ZORDER.Header"
},
"CompanyID":"",
"StockRoomID":"",
"SalesDocument":"60000353",
"ReferenceDoc":"",
"AccountNumber":"",
"PoNumber":"",
"Message":"Return order 0060000353 has been created successfully",
"OrderTotal":"0.00",
"StockRoomName":"",
"Return":"",
"Reason":"",
"Auth":"",
"ItemSet":null,
"HeaderCSDSet":{
"__deferred":{
"uri":"https://.../sap/opu/odata/sap/ZORDER/HeaderSet('60000353')/HeaderCSDSet"
}
},
"AddressSet":{
"__deferred":{
"uri":"https://.../sap/opu/odata/sap/ZORDER/HeaderSet('60000353')/AddressSet"
}
},
"GeneralCommentsSet":{
"__deferred":{
"uri":"https://.../sap/opu/odata/sap/ZORDER/HeaderSet('60000353')/GeneralCommentsSet"
}
},
"CreditCardSet":{
"__deferred":"uri":"https://.../sap/opu/odata/sap/ZORDER/HeaderSet('60000353')/CreditCardSet"
}
}
}
}

Answer 1

This is a scenario of dependant Entity or Navigation property from Header to Item. Google "Deep Entity in SAPUI5 and oData for more understanding".
There is an error in your code where you have mentioned: "the logic is wrong".
Just add one line after the for loop:
oEntry.Items = ItemSet;
Let me know if this helps.