We make use of the Web Reference table in the System component of Outsytems in order to dynamically change the base URL of a SOAP Service. 

Some of our Web Services have been switched to Inactive for an reason unknown to us? 

How can this be switched back to active and please why was the web reference switched to inactive? 

Thanks in Advance.

Are you seeing issues with accessing or using the service in question?

What version of OutSystems platform are you on?

If you are on OS11, you may need to change how you're approaching this:

https://success.outsystems.com/Documentation/11/Reference/OutSystems_APIs/SOAP_Extensibility_API

This documentation may help with your scenario:

https://success.outsystems.com/Documentation/11/Extensibility_and_Integration/SOAP/Consuming_SOAP_Web_Services/Use_Advanced_Extensibility/Example%3A_Change_service_endpoint_at_runtime