ID assignment in composite entity

When importing a composite entity with headers and lines to D365 F&O, you can let the system assign IDs and apply them to both headers and lines. For example, I can import the following file with sales order data: <?xml version="1.0" encoding="utf-8"?> <Document> <SALESORDERHEADERV3ENTITY> <ORDERINGCUSTOMERACCOUNTNUMBER>CustA</ORDERINGCUSTOMERACCOUNTNUMBER> <SALESORDERLINEV2ENTITY> <ITEMNUMBER>ItemA</ITEMNUMBER> <ORDEREDSALESQUANTITY>1</ORDEREDSALESQUANTITY> </SALESORDERLINEV2ENTITY> <SALESORDERLINEV2ENTITY> <ITEMNUMBER>ItemB</ITEMNUMBER> <ORDEREDSALESQUANTITY>2</ORDEREDSALESQUANTITY> </SALESORDERLINEV2ENTITY> </SALESORDERHEADERV3ENTITY> <SALESORDERHEADERV3ENTITY> ...

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