Description:
------------
After sending data to the server, the answer comes:
SOAP-ERROR: Encoding: Violation of encoding rules
This is a bug or some configuration C# client?

Test script:
---------------
Link to document, included all scripts : https://docs.google.com/document/d/137nTNdBEP5BbB_k0wDgcFsMr3wbmimpYPffC2f2NiR4

Expected result:
----------------
In method "_call" in class SoapService I expect next array:
Array
(
    [session_id] => vhjd4c9foqmuca4cucgp7sh6r6
    [activities] => Array
        (
            [activity_id] => Array
                (
                    [0] => 1
                    [1] => 2
                )
        )
)