Web Services - Filter on Page including @ returns no records

Hi Mibuso-fans,

I am currently working with web services and an issue arises that I am unable to resolve. I publish the standard pages (e.g. Contact-Page) and develop in my C#-application against that scheme. Everything works fine unless I try to filter on fields that contain special characters such as "@".

The following example shows my code:

List<Contact_Filter> filterArray = new List<Contact_Filter>();
Contact_Filter contactFilter = new Contact_Filter();
contactFilter.Field = Contact_Fields.Name;
contactFilter.Criteria = "testmail";
Contact[] contactList = new Contact[1000];
filterArray.Add(contactFilter);

contactList = contactWs.ReadMultiple(filterArray.ToArray(), "", 50);

The contactList is empty even if contacts in NAV have exactly that Name assigned. If I work with XML-Ports instead of Pages, @-characters are no problem.

Is this a common problem? Is a workaround or a solution available?

Thanks!
Jut