Use Transaction SE80 to maintain E4C Web Service configuration. Choose the Package /PACG/ECM, then select the node at the left side "Enterprise Services" -> "Service Definition" and finally choose the service /PACG/ECM_WS:
Once you press the button presented on the screenshot above, the transaction SOAMANAGER will be launched. Login with your SAP user when the browser is launched and click create service.
...