MS Dynamics NAV: Updating data

When updating an object in MS Dynamics NAV you will receive an error message:

    HTTP/1.1 400 Bad request
    <m:message xml:lang="en-US">
        An error occurred while processing this request.
    </m:message>

ruby_odata inserts an __metadata attribute in the class:

    # Fill metadata 
    meta_id = entry.xpath("./atom:id", @ds_namespaces)[0].content 
    klass.send :__metadata=, { :uri => meta_id }

When updating the object, this __metadata will be included in the JSON document, but the NAV server does not accept this unknown value.

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