WCF,Soap -> How can I eliminate an Element-Name in [MessageBodyMember] - wcf

Question

I am building a SOAP Server with WCF in C#.
I have an Request from a Client thats looks like that :
<s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<sendLocalListRequest xmlns="urn://Ocpp/Cp/2012/06/">
<updateType>Full</updateType>
<listVersion>5678</listVersion>
<localAuthorisationList>
<idTag>1111111</idTag>
<idTagInfo>
<status>Accepted</status>
<expiryDate>2015-10-27T00:00:00</expiryDate>
<parentIdTag>555</parentIdTag>
</idTagInfo>
</localAuthorisationList>
<localAuthorisationList>
<idTag>2112432</idTag>
<idTagInfo>
<status>Accepted</status>
<expiryDate>2015-10-29T00:00:00</expiryDate>
<parentIdTag>555</parentIdTag>
</idTagInfo>
</localAuthorisationList>
<localAuthorisationList>
<idTag>44444444</idTag>
<idTagInfo>
<status>Accepted</status>
<expiryDate>2015-10-29T00:00:00</expiryDate>
<parentIdTag>2222</parentIdTag>
</idTagInfo>
</localAuthorisationList>
<hash>bhghs77767676777</hash>
</sendLocalListRequest>
I have to get this Request and store the Data between the Elements localAuthorisationList in a file on harddisk.
I made an [MessageContract] that Looks :
[MessageContract(IsWrapped = true, WrapperName = "sendLocalListRequest",
WrapperNamespace = "urn://Ocpp/Cp/2012/06/")]
public class sendLocalListRequest
{
[MessageBodyMember(Order=1)]
public UpdateType updateType;
[MessageBodyMember(Order=2)]
public int listVersion;
[MessageBodyMember(Order=3)]
public localAuthorisation[] localAuthorisationList;
[MessageBodyMember(Order=4)]
public string hash;
}
[DataContract(Namespace = "urn://Ocpp/Cp/2012/06/")]
public class localAuthorisation
{
[DataMember(IsRequired=true, Name = "idTag", Order = 1)]
public string idTag;
[DataMember(Name="idTagInfo", Order=2)]
public Data idTagInfo;
}
[DataContract(Namespace = "urn://Ocpp/Cp/2012/06/")]
public class Data
{
[DataMember(Name = "status", Order=1)]
public string Status;
[DataMember(Name = "expiryDate", Order=2)]
public DateTime ExDate;
[DataMember(Name = "parentIdTag", Order = 3)]
public string parentTag;
}
But with the WCFTestClient I get the following Request :
<s:Body>
<sendLocalListRequest xmlns="urn://Ocpp/Cp/2012/06/">
<updateType>Differential</updateType>
<listVersion>0</listVersion>
<localAuthorisationList xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<localAuthorisation>
<idTag>sfdsdgfg</idTag>
<idTagInfo>
<ExDate>2015-11-02T16:37:00</ExDate>
</idTagInfo>
</localAuthorisation>
<localAuthorisation />
</localAuthorisationList>
<hash i:nil="true" xmlns:i="http://www.w3.org/2001/XMLSchema-instance" />
</sendLocalListRequest>
</s:Body>
My problem is, that I have an element too much (localAuthorisationList or localAuthorisation). Can I eliminate one Element? And how?
Thank you for your help
Tom