HANA XSODATA Create multiple entities with associations in single LUW

Hi all,
Is it possible to create multiple entities with associations in a single LUW.
For e.g. we have a Sales Order and Item. This is modelled as 2 DB tables and 2 entities.
In XSOData I have defined association relationship between them.My XSOData definition is like this...
"XSDemo.DB::SO"    as "SalesOrder"
   navigates ("SalesOrder_OrderItem" as "SOItem");
   "XSDemo.DB::ITEM" as "OrderItem";
   association "SalesOrder_OrderItem" principal "SalesOrder"("OrderID") multiplicity "1"
   dependent "OrderItem"("OrderID") multiplicity "*";
My post URI is
http://server:port/SODemo.xsodata/SalesOrder
My data is as follows
"ID": 1,
"Customer": 123,
"Desc": "Test SO",
"SOItem": [
      "Material": "MAT1",
      "Qty": "10",
      "Item": "10"
      "Material": "MAT2",
      "Qty": "20",
      "Item": "5"
From the post, I get a response 201 (Created). However, only the Sales Order is created. The Items are not created.
My question is:
1. Is it possible to create Order and Item together in a single post call ?? If yes, how. What is the syntax of XSOData / Post Request
2. If it is not possible to create Order and Item together in a single post call, then how do we ensure atomicity of the transaction.
For e.g. What is Order creation is success and then the Item creation fails ...
How can we ensure that all is committed or none is committed.
3. From the documentation I understand that this might be possible using modification exits... However, I want to achieve this without using modification exits...
Is this possible or not ?

Hi Thomas,
Actually the problem is that Sales Order and Order Items are modeled as different entities... So, XSOData allows creation of Sales Order Item independently WITHOUT creation of a sales order header.
For e.g. URL : http://server:port/SODemo.xsodata/OrderItem
Ideally, the XSOData should implement a logic that a Dependent entity cannot be created without a Principal entity.
For e.g. using a Sales order BAPI you cannot create a sales order item alone !
Similarily, since XSOData is the end point service for the consumer, the XSOData should have the logic to ensure that both principal and dependent entities are created together.
Otherwise, in the UI the developer has to ensure that the post body is build correctly...

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