WCF MSMQ unable to serialize interface of DataContract

Hi,

I am trying to send a datacontract object to message queue. one of the property is return a interface type.

I get this errors:

{"Cannot serialize member Dealogic.ClientManager.Domain.DataTransferObjects.
ContentTransferObject.Analyst of type Dealogic.ClientManager.Domain.Interfaces.
IAnalyst because it is an interface."}

did I miss any attribute?
One of the solution I found is changing the IAnalyst to an abstract class and use XMLInclude
but that would require a major change. any other work around?

thank you,
DL

[DataContract]
    [KnownType( typeof( AnalystTransferObject ) )]
        public class ContentTransferObject : BaseTransferObject, IContent  {

        [DataMember]
        public ContentType ContentType { get; set; }

        [DataMember]
        public int ContentNo { get; set; }

        [DataMember]
        public string Headline { get; set; }

        [DataMember]
        public IAnalyst Analyst { get; set; }
}

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