Some SSCUIs do not allow the user to create a new record: these SSCUIs do not require the deletion feature.  If deletion is possible, a delete button will appear at the top of the SSCUI.  If you try to delete an SAP authored record, you will get an error message.

In 1902, an additional column appears in the Excel list of SSCUIs available in SAP Activate.  This  identifies which SSCUIs have been enabled with the deletion feature.  We plan to enable deletion in more SSCUIs every release.