authorizations for web services

The problem is most likely related to this thread:

[Enterprise services consumption by 3rd party -> Security;

Get someone from authorizations to assist you. You'll need to have either the role SAP_BC_WEBSERVICE_CONSUMER or SAP_BC_WEBSERVICE_ADMIN

assigned to the user you're using. Then in TCode PFCG you'll need to check that that both of the roles above have the underlying authorization

object called 'S_SERVICE'. If not, re-generate them in TCode PFCG until you have all green lights there. Then re-test your webservice with WSNavigator.

At least you're starting to get more generic errors now that you'll find by searching in SDN. I think you should be able to tackle them yourself from here.