XML child Elements

I'm trying to add and element before a child but not having much look. I think it's something obvious but i'm seeming nothing. What i'm trying to get and i have cut down to only the relevant information is. I have asked before and i'm now trying to delete that question because it was a bit confusing

<lv_ordertype>Order</lv_ordertype><references><WebReference><reference_index>7</reference_index><reference_value>ST</reference_value><WebReference></references><customer /><delivery>

but what i'm getting is

<lv_ordertype>Order</lv_ordertype><references><reference_index>7</reference_index><reference_value>ST</reference_value></references><customer /><delivery>

My code looks like this for this section

[System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "4.6.81.0")]
[System.SerializableAttribute()]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true)]
public partial class WebSalesOrderreferences
 {
    private string reference_indexField;
    private string reference_valueField;
  //  [XmlArray("WebReferences")]
    private string reference_7Field;
    private string reference_8Field;
    /// <remarks/>
    [System.Xml.Serialization.XmlElementAttribute(Form = System.Xml.Schema.XmlSchemaForm.Unqualified)]
    public string reference_index
    {
        get
        {
            return this.reference_indexField;
        }
        set
        {
            this.reference_indexField = value;
        }
    }
    /// <remarks/>
    [System.Xml.Serialization.XmlElementAttribute(Form = System.Xml.Schema.XmlSchemaForm.Unqualified)]
    public string reference_value
    {
        get
        {
            return this.reference_valueField;
        }
        set
        {
            this.reference_valueField = value;
        }
    }
}

I thought it would be as simple as putting an xmlarray but that didn't work. Just for information this is pushing from Mircosoft CRM to our Accounts system

Kind Regards

Dan