If a WSDL W1 is already referred to by another WSDL W2, WSDL W1 cannot be replaced by a new WSDL that has a modified file name or a modified namespace. This restriction does not apply if the create new version option is used.

When you use the Attach button, you can only attach a WSDL file to the most recent version of a Service asset.

If you attach a WSDL with a different file name and/or a different namespace, then there must not be another existing WSDL with same name and namespace.

Consider the Service asset has a Name Validate Policy defined that enforces unique name. In this case; the WSDL file is attached only if the Service name in the WSDL is the same as the Name pattern defined in the validation policy.