Yes, deleting the properties is what you need to do.
Open the property record - the page-type property located in SAE-HRServices-Work
Click the Delete button (upper-right side of the Header bar). Follow the prompts after that.
Then, when you create the new property, do not click Save until after you have set the property type to Single Page. And, maybe not even until after you have set all the metadata as described in the procedure.