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API v7.0 requires you to use the correct XML Schema namespaces

For anyone moving from pre 7.0 to 7.0 and running into probems where you get a 'must send concrete type' when you think you are sending a concrete type, make sure you're using the correct 2001 xml schema namespaces, e.g. (prefix's don't matter)
mlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
mlns:xsd="http://www.w3.org/2001/XMLSchema"

and not one of the earlier interim namespaces such as
mlns:xsi="http://www.w3.org/1999/XMLSchema-instance"