I would only use a web service connector in early development. Once you have things working, modify the generated Flow service to read the endpoint address from a properties file (or database table, if you prefer).
Promotion to the next environment should not involve regenerating the Flow service (web service connector) from a new WSDL. Move the code and update the properties file or database table with the correct endpoint address (and login credentials, if required).
Mark
#webMethods#API-Management#soa