When creating an enumeration constraint on a Data Type the following happens:-
- Click "Add" blue icon and a new row is created
- Enter a value
- Before clicking the check/tick click the "Add" blue icon again
- Another new row is created.
- Enter a value.
- Click the blue check/tick icon on the row.
- Both rows are committed.
You'd think the blue check/tick icon would only affect a single row as it is shown individually for each row. It would also be consistent with the behaviour on the main Data Type editor list.