WS-Enumeration defines an output-only (ie. solicit-response) operation as 
follows: 
<wsdl:portType name="DataSource"> 
  ... 
  <wsdl:operation name="EnumerationEndOp" > 
    <wsdl:output 
      message="wsen:EnumerationEndMessage" 
      wsa:Action="
http://schemas.xmlsoap.org/ws/2004/09/enumeration/EnumerationEnd"/> 
  </wsdl:operation> 
</wsdl:portType> 

WS-I Basic Profile R2303 says the following: 
4.5.2 Allowed Operations 
Solicit-Response and Notification operations are not well defined by WSDL 
1.1; furthermore, WSDL 1.1 does not define bindings for them. 

R2303 A DESCRIPTION MUST NOT use Solicit-Response and Notification type 
operations in a wsdl:portType definition. 

A solicit-response message reverses the interact between the service and 
the client. Typically, the client is responsible for initiating the 
interaction, but with solicit-response the service is sending an 
unsolicited message to the client.  BP determined that there wasn't any 
consensus on how to implement this (what would be the trigger mechanism 
for this message exchange, or how does the service initiate a connection 
with a client that might not allow incoming connections), thus BP banned 
it. 

Proposal:
Remove this operation.