AX 2012 - Endpoint error when using web service via C#-Projekt Service Reference

Hello together,

I'm trying to consume a web service via a C#-Project in AX 2012 (included as a service reference). When running the web service I'm getting the following error:

Could not find default endpoint element that references contract 'CustomerService.CustomerService' in the ServiceModel client configuration section. This might be because no configuration file was found for your application, or because no endpoint element matching this contract could be found in the client element.

From my point of view the app.config looks alright:

<?xml version="1.0" encoding="utf-8" ?>

<configuration>

       <configSections>

       </configSections>

    <system.serviceModel>

        <bindings>

                <binding name="CustomerServiceSoap" closeTimeout="00:01:00" openTimeout="00:01:00"

                    receiveTimeout="00:10:00" sendTimeout="00:01:00" allowCookies="false"

                    bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"

                    maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536"

                    messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"

                    useDefaultWebProxy="true">

                    <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"

                        maxBytesPerRead="4096" maxNameTableCharCount="16384" />

                    <security mode="Transport">

                        <transport clientCredentialType="None" proxyCredentialType="None"

                            realm="" />

                        <message clientCredentialType="UserName" algorithmSuite="Default" />

                    </security>

                </binding>

                <binding name="CustomerServiceSoap1" closeTimeout="00:01:00"

                    openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"

                    allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"

                    maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536"

                    messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"

                    useDefaultWebProxy="true">

                    <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"

                        maxBytesPerRead="4096" maxNameTableCharCount="16384" />

                    <security mode="None">

                        <transport clientCredentialType="None" proxyCredentialType="None"

                            realm="" />

                        <message clientCredentialType="UserName" algorithmSuite="Default" />

                    </security>

                </binding>

            </basicHttpBinding>

            <customBinding>               

            </customBinding>

        </bindings>

        <client>           

            <endpoint address="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"

                binding="basicHttpBinding" bindingConfiguration="CustomerServiceSoap"

                contract="CustomerService.CustomerServiceSoap" name="CustomerServiceSoap" />

        </client>

    </system.serviceModel>

</configuration>

Any help appreciated.

Sebastian