You didn't say what the errors were...
Make sure that PBWSClient105.pbd (from \Program Files (x86)\Shared\PowerBuilder, or whatever that same folder was for the 10.5 release) is in your project's library list.
And NOT PBSoapClient105.pbd...
The SoapConnection class (among others) is defined in both PBDs - one is for .Net, the other is for EasySoap. You only need one and adding both can result in errors (depending upon which one is first in the library list).
-Paul-