Dynamics NAV Web Service

I want to consume a web service created in Microsoft Dynamics NAV.

While trying to import the WSDL from URL (http://sqlnav:7047/DynamicsNAV/WS/Codeunit/Letters) I get the error message “Fatal Error: URI=null Line=-1: Premature end of file.”

The WSDL file, copied from Internet Explorer is shown below.

What can I do to consume a web service from Microsoft Dynamics NAV?

WSDL:

Subject: Update 8.5.1

Updating to 8.5.1 changed the problem but didn’t solve it: http://www-10.lotus.com/ldd/nd85forum.nsf/DateAllThreadedWeb/f0ca6cbe96ae844a052576820044fc55?OpenDocument