I am utilizing the GroupwiseService.php API and I have no problems connecting to the SOAP service, setting my view, and retrieving attachments information via getItemRequest(). I get the unique ID that pertains to an attachment but when I call the getAttachmentRequest() method, I receive this exception:

Function ("getAttachmentRequest") is not a valid method for this service

The SOAP service is not recognizing the request even though that method is defined in the WSDL and in the API Docs. I am wondering if this is an existing bug or if there is an alternative way to retrieve attachments. My goal is to be able to save these attachments to the local file system.