Insert Multiple Sales Lines with OData

Hi All,

I'm simply trying to insert multiple sales lines to one Sales Order using OData, the only way I found is to call the OData service multiple times but cannot manage to bulk insert in a single call.
I'm using Postman for the test.
This is the link i'm using

http://xxx.xxx.xxx.xxx:18048/WI/OData/Company('%2A%2A%2A%2ATEST%203%2A%2A%2A%2A')/SalesOrder(Document_Type='Order',No='1234')/SalesOrderLines

This Json body works:

{
"Type": "Item",
"No": "123",
"Quantity": "5",
"Unit_Price": "9"
}

but if i try to put it in an array it gives me "400 Bad Request" with msg: "An error occurred while processing this request."

Thank you all.
Amr.