In the section 6 (CREATING THE CAMPAIGNCONNECTORMANAGER REPLACING MODULE FOR ADDING THE FLOW OPERATION LOGIC), it said “create a new module schema replacing the CampaignConnectorManager”
I can’t create a “replacing client module“ with another name “TestSmsCampaignConnectorManager”
And I can’t inherit that module when I create a module, system said “Substitution of modules is not allowed”. After saved, the parent object “CampaignConnectorManager” will remove when refresh page.
In order to override the CampaignConnectorManager module you can create a new module and use "override" as it showed on the screenshot by the link below