I am following the exercise CONFIGURING REFERENCE DATA / step: Configure a data page to return a filtered list of data providers and in step 7 Click Create and open to create the new data page -and when I click on "create an open" to create a page with Label: "Filtered service provider list" I am getting an error: Page Name - rule already exsists (with the identifier: D_serviceproviderList)
Data pages must have a unique name across the entire system. It seems that the data page name isn’t changing as it should in the exercise. As a result, you’re attempting to create your data page with the name of an existing page, leading to the error you’re experiencing.
In that exercise, step 6 (changing the label for the data page) should have triggered a change to the name of the data page (displayed to the right of the label field). If the name is doeen’t change, repeat step 5 and make sure you select the Saveas option to create the new data page.