Updating user with Org Units using NSAPI

Question

We have a requirement where we need to update users with different Organizational Units using an external system. The integration guide lists an NSAPI that might be used for this operation, Create/Update Person. This just says that we need to use the XML received from a Get person details API and use it as a request XML.
The problem we are facing is figuring out where to place the new Org Unit details in the request XML.Would anyone know about that detail.
Is this even the correct API for achieving the requirement or are we looking at the wrong thing here

Answer 1

Hi,
I've changed the input type to select(multiple) for that field and it works fine when I order it from the portal directly. Its able to set multiple values into the field when an sql query return more than one row.
The problem only occurs when I use the RAPI for making a request to that service.
The structure I use for passing data to that field is:
                   <req:Field>
                         <req:name>FieldName</req:name>
                           <req:value>                             
                              <req:string>Value1</req:string>
                              <req:string>Value2</req:string>
                           </req:value>
                    </req:Field>
which is what you've pasted above.
Even if I stop sending any value to this field and only send values to other single value fields, it still gives the same error message.