The URI for your data items is extremely important as it shows where on your website you would like the markup to be deployed. It is important that the URI is correct and that you use different hashtags at the end of the URI to distinguish between different data items that are pointing to the same page.
Here’s how to make the changes:
Open the data item in the editor.
Click “Change Item URI”
Make your desired changes.
Select “Change Item URI”
Check and make sure that the associated URL field is correct. If not, update that as well.
There are a few errors that may appear, find out more about them here.