The WSDL has 2 malformed elements. It has been a long time since I did a SOAP based integration, but as I remember the MXBoolean does not generate correctly. Fortunately, you can manually fix those two elements safely and then allow VS to create your stub for you.
If you have the actual error and sample WSDL files I can probably provide the fix for you. I used to have this on hand, but like I said, it has been a decade since I last encountered this.
Jason
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Jason VenHuizen
https://sharptree.iohttps://opqo.io------------------------------