[ServiceKnownType] help needed

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C#

WCF

I'm having a problem with a WCF call where [ServiceKnownType] is required.

the relevant service contract has

[ServiceKnownType(typeof(List<Object))] 

But when I make a call to it, I get ArrayOfanyType is not expected and advice to use the ServiceKnownType or DataContractResolved.

In order to pass the list I have to open Reference.cs on the client side and change:

[System.ServiceModel.ServiceKnownTypeAttribute(typeof(object[]))]

to

using System;
using System.Collections.Generic;
       // [System.ServiceModel.ServiceKnownTypeAttribute(typeof(object[]))]
        [System.ServiceModel.ServiceKnownTypeAttribute(typeof(List<object>))]

Which begs the question
how or why does service entry

[ServiceKnownType(typeof(List<Object>))]

become client entry

[System.ServiceModel.ServiceKnownTypeAttribute(typeof(object[]))]

and what can be done to prevent this?