You need this parent for inherit the connection credentials. You can change this parent to existing Datasource. This will be solve your error message.
Seems about right, unfortunately changing the parent device to an existing datasource cant be done, know of any other work-arounds?
what's the reason behind setting up WMI in a parent/child format?
This was a decision made before my time, makes the management and troubleshooting of datasources quite difficult and also spams up the receiver logs with 1270.0.XX WMI connection failed errors.