Note that you can only delete a structure in the ABAP Dictionary when it is no longer used in other objects (for example as a substructure in other tables or structures). You can get an overview of where a structure is still being used with Utilities® Where-used list.
Proceed as follows to delete a structure:
A dialog box appears in which you are asked to confirm the deletion request.
The structure is now deleted if it is no longer being used in other objects.