Problem: The current labelling for the extensions of the use case shown below suggests that these extensions occur after step 2, i.e. after ListingBook adds the listing. Instead, the extensions should be labelled starting with 1 (e.g. 1a, 1b) to show that the input validation occurs after the user enters their input, but before ListingBook adds the listing.
Problem: The current labelling for the extensions of the use case shown below suggests that these extensions occur after step 2, i.e. after ListingBook adds the listing. Instead, the extensions should be labelled starting with 1 (e.g. 1a, 1b) to show that the input validation occurs after the user enters their input, but before ListingBook adds the listing.