Currently, I am using the `TransportationOrderConfirmation_In` Service to change a Freight Order - assign a Document Reference to it, as well as to change the confirmation status and it works fine.
The requirement is to do similar thing but with the Freight Unit - I have to assign the Document Reference to it. The above service is surely prepared to work only with the Freight Units according to the description and my testing. When I try to give the FU Number in the XML it returns an error saying that "confirmation relates to an outdated version of freight order".
What should I do to be able to assign the Document Reference to the Freight Unit accordingly as it happens in the example with the FO described above?