VB.NET Soap Method Not Exposed

[mikek999]

I am writting a program that communicates with Amazon Seller services. One of the tasks involved is the uploading and downloading of XML documents containting order information. Below is the example source code provided by Amazon for vb.net. I finally got most of the code working, but I am stuck on one issue. A method is not exposed that should be. The Attachments method is not available for the RequestSoapContext method. I am at a loss as to why this might be the case. Unfortunately the documentation and support from Amazon is pretty much nonexisting. There was a post regarding this on the Amazon Developer Forum, but it did not fix my problem. They post stated that the issue was with Web Services 2.0 not being installed correctly. They suggested that I uninstall Web Services 2.0 and reinstall selecting the Developer option. This didn't corrrect the problem. Below is the sample code that I'm trying to get to work. Any help or ideas in this would GREATLY be appreciated. This is my first Soap project so I'm kinda at a loss as to what could be causing my problem of the Attachment method not getting exposed.

WSDL=http://sellercentral.amazon.com/help/merchant_documents/WSDL/merchant-interface-dime-dotnet.wsdl

Dim merchant As New com.amazon.sellercentral.Merchant
merchant.merchantIdentifier = "<my merchant id>"
merchant.merchantName = "<my merchant name>"

Dim mi As New com.amazon.sellercentral.merchantinterfacedimeWse

mi.Url = "http://merchant-api.amazon.com/gateway/merchant-interface-dime/"

Dim networkCreds As New System.Net.NetworkCredential
networkCreds.UserName = "<username>"
networkCreds.Password = "<password>"

mi.Credentials = networkCreds
mi.PreAuthenticate = True

Dim theAttachement As New DimeAttachment("text/xml", TypeFormat.MediaType, File.OpenRead("c:\mike.txt"))
theAttachement.Id = Guid.NewGuid().ToString

Dim theDoc As New com.amazon.sellercentral.ReferencedBinary
theDoc.location = theAttachement.Id

mi.RequestSoapContext.Attachments.Add(theAttachment) <--- the attachment method is not exposed

Dim theResponse As com.amazon.sellercentral.DocumentSubmissionResponse = mi.postDocument(merchant, "_POST_PRODUCT_DATA_", theDoc)

MsgBox(theResponse.documentTransactionID)

Thanks,
Mike Kelley
[e-mail]