I'm trying to restart PCo agents from MII using the http://hostname:50050/PCoMangement web service. I'm using the Web Service action block.
Making use of PCO version 2.3041856.1458(31/01/2014 11:58:48AM) I have no issues.
Something changed though in PCO version 2.304.1889.1551 (05/03/2014 7:57:02AM), besides the version number 
When I click FINISH in the "configure object" web service action block, I get an error: "XML Proxy Error: Could not create XMLGenerator, Schema Was Null". Is this supposed to happen? I'm not aware of any procedure to change the PCO web service internals .. Is there one?
Same MII 14.0 SP4 .. different PCo versions. There is another thread here showing the same error, and in that case, the Web Service configuration changed. Are we in the same situation? They solved it be changing the web service back from RPC type to Documentstyle.