update-order-entry-transaction-legacy - null XML

[MiloDBD]

I'm updating a order entry line and if I try an update the price, the XML is creating null elements for itemid and quantity as these are allowing null. The affect is the line is orphaned from the sales order.

<itemid/>
source

<quantity/>
source

I have to pre-read the object, copy the values, then update.. is there a reason why these are true?