Navigation Field Doesn't navgiate me to the selected record in my Many2many linked records

Basically the following record doesn’t allow me to navigate, even though I have the same setup on another screen and it works, maybe its something I’m missing with Many2many and parent child setup, when I pick a record nothing happens and the field resets to the value of the current record

I was basically going for a Many2many relationship between my custom dac and the Contact dac, and having in a FormGrid screen

namespace Telemarketing
{

    [PXPrimaryGraph(typeof(TeleMarketerListMaint))]
    [PXCacheName(Messages.TeleMarketerList)]
    public class TeleMarketerList : PXBqlTable, IBqlTable
    {



        #region ListID 
        public abstract class listID : PX.Data.BQL.BqlString.Field<listID> { }
        [PXDBString(15, IsKey = true, IsUnicode = true, InputMask = ">CCCCCCCCCCCCCCC")]
        [PXDefault()]
        [PXUIField(DisplayName = "List ID", Visibility = PXUIVisibility.SelectorVisible, Required = true)]
        [PXSelector(typeof(Search<TeleMarketerList.listID>),
            typeof(TeleMarketerList.listID),
            typeof(TeleMarketerList.description),
            DescriptionField = typeof(TeleMarketerList.description),
            Filterable = true)]
        [AutoNumber(
            typeof(Search<CRSetup_Extension.usrTeleMarketerListNumberingID>),
            typeof(AccessInfo.businessDate)
        )]
        public virtual string ListID { get; set; }
        #endregion
}

namespace Telemarketing
{
    [PXCacheName("Telemarketer List Contact")]
    public class TeleMarketerListContact : PXBqlTable, IBqlTable
    {
        #region ListID (Foreign Key to TeleMarketerList)
        public abstract class listID : PX.Data.BQL.BqlString.Field<listID> { }
        [PXDBString(15, IsKey = true, IsUnicode = true)]
        [PXUIField(DisplayName = "List ID")]
        [PXDBDefault(typeof(TeleMarketerList.listID))]
        [PXParent(typeof(Select<TeleMarketerList, Where<TeleMarketerList.listID, Equal<Current<TeleMarketerListContact.listID>>>>))]
        public virtual string ListID { get; set; }
        #endregion

        #region ContactID (Foreign Key to Contact)
        public abstract class contactID : PX.Data.BQL.BqlInt.Field<contactID> { }
        [PXDBInt(IsKey = true)]
        [PXUIField(DisplayName = "Contact")]
        [PXSelector(typeof(Search<Contact.contactID>),
            typeof(Contact.displayName),
            typeof(Contact.eMail),
            typeof(Contact.phone1),
            DescriptionField = typeof(Contact.displayName),
            SubstituteKey = typeof(Contact.displayName))]
        public virtual int? ContactID { get; set; }
        #endregion
}
}

<%@ Page Language="C#" MasterPageFile="~/MasterPages/FormDetail.master" AutoEventWireup="true" ValidateRequest="false" CodeFile="XT201000.aspx.cs" Inherits="Page_XT201000" Title="Untitled Page" %>
<%@ MasterType VirtualPath="~/MasterPages/FormDetail.master" %>

<asp:Content ID="Content1" ContentPlaceHolderID="phDS" Runat="Server">
    <px:PXDataSource ID="ds" runat="server" Visible="True" Width="100%" 
                     PrimaryView="Document" TypeName="Telemarketing.TeleMarketerListMaint">
        <CallbackCommands>
            <px:PXDSCallbackCommand Name="Insert" PostData="Self" />
            <px:PXDSCallbackCommand CommitChanges="True" Name="Save" />
            <px:PXDSCallbackCommand Name="First" PostData="Self" StartNewGroup="True" />
            <px:PXDSCallbackCommand Name="Last" PostData="Self" />
            <px:PXDSCallbackCommand Name="AddContacts" Visible="False" />
            <px:PXDSCallbackCommand Name="RemoveContact" Visible="False" />
        </CallbackCommands>
    </px:PXDataSource>
</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="phF" Runat="Server">
    <px:PXFormView ID="form" runat="server" DataSourceID="ds" Width="100%" 
                   DataMember="Document">

        <Template>           
            <px:PXSelector CommitChanges="True" runat="server" 
               ID="edListID" DataField="ListID" 
               AutoRefresh="True">
                <GridProperties>
                    <Layout ColumnsMenu="False" />
                </GridProperties>
            </px:PXSelector>
            <px:PXCheckBox ID="chkIsActive" runat="server" DataField="IsActive" />
            <px:PXLayoutRule runat="server" StartRow="True" LabelsWidth="M" ControlSize="XXL" />
            <px:PXTextEdit ID="edDescription" runat="server" DataField="Description" />
        </Template>
    </px:PXFormView>
</asp:Content>

<asp:Content ID="Content3" ContentPlaceHolderID="phG" Runat="Server">
    <px:PXTab ID="tab" runat="server" Width="100%" Height="150px" DataSourceID="ds" DataMember="Document">
        <Items>
            <px:PXTabItem Text="Contacts">
                <Template>
                   <px:PXGrid ID="gridContacts" runat="server" DataSourceID="ds" Width="100%" 
                               Height="400px" SkinID="Details" TabIndex="300" AllowInsert="False">
                        <Levels>
                            <px:PXGridLevel DataMember="Contacts" >
                                <Columns>
                                    <px:PXGridColumn DataField="ContactDisplayName" Width="200px" />
                                    <px:PXGridColumn DataField="ContactEmail" Width="200px" />
                                    <px:PXGridColumn DataField="ContactPhone" Width="120px" />
                                    <px:PXGridColumn DataField="DateAdded" Width="90px" />
                                    <px:PXGridColumn DataField="IsActive" Type="CheckBox" Width="60px" />
                                </Columns>
                            </px:PXGridLevel>
                        </Levels>
                        <ActionBar>
                            <CustomItems>
                                <px:PXToolBarButton Key="AddContacts" Text="Add Contacts">
                                    <AutoCallBack Command="AddContacts" Target="ds" />
                                </px:PXToolBarButton>
                                <px:PXToolBarButton Key="RemoveContact" Text="Remove">
                                    <AutoCallBack Command="RemoveContact" Target="ds" />
                                </px:PXToolBarButton>
                            </CustomItems>
                        </ActionBar>
                        <AutoSize Container="Parent" Enabled="True" MinHeight="400" />
                    </px:PXGrid>
                </Template>
            </px:PXTabItem>
        </Items>
        <AutoSize Container="Window" Enabled="True" MinHeight="150" />
    </px:PXTab>

    <!-- Smart Panel for Adding Contacts -->
    <px:PXSmartPanel ID="pnlAddContacts" runat="server" Caption="Add Contacts" 
                     CaptionVisible="true" DesignView="Hidden" LoadOnDemand="true" 
                     Key="AvailableContacts" AutoCallBack-Enabled="true" AutoCallBack-Target="gridAvailableContacts" 
                     AutoCallBack-Command="Refresh" CallBackMode-CommitChanges="True" 
                     CallBackMode-PostData="Page" AcceptButtonID="btnAddContactsOK" 
                     CancelButtonID="btnAddContactsCancel">
        <px:PXGrid ID="gridAvailableContacts" runat="server" DataSourceID="ds" 
                   Width="100%" Height="400px" SkinID="Inquire" TabIndex="500">
            <Levels>
                <px:PXGridLevel DataMember="AvailableContacts">
                    <Columns>
                        <px:PXGridColumn AllowCheckAll="True" DataField="Selected" 
                                         TextAlign="Center" Type="CheckBox" Width="40px" />
                        <px:PXGridColumn DataField="DisplayName" Width="200px" />
                        <px:PXGridColumn DataField="EMail" Width="200px" />
                        <px:PXGridColumn DataField="Phone1" Width="120px" />
                        <px:PXGridColumn DataField="BAccountID" Width="100px" />
                    </Columns>
                </px:PXGridLevel>
            </Levels>
            <AutoSize Container="Parent" Enabled="True" MinHeight="400" />
        </px:PXGrid>
        <px:PXPanel ID="pnlAddContactsButtons" runat="server" SkinID="Buttons">
            <px:PXButton ID="btnAddContactsOK" runat="server" DialogResult="OK" Text="Add Selected" />
            <px:PXButton ID="btnAddContactsCancel" runat="server" DialogResult="Cancel" Text="Cancel" />
        </px:PXPanel>
    </px:PXSmartPanel>
</asp:Content>