Interrapt G26

The "Surname" field in "Edit" section of Attendees should accept only "-" and "." special characters

Steps
1.Navigate to "Interrapt"
2.Open "Attendees"
3.Click on "Edit" button on some of the created attendees
4.In "Surname" field insert surname with any special character except "-" and "."
5.Fill the other fields with valid data
6.Click on "Edit" button

Expected result
There should be message shown that the surname field is required in red letters

Actual result
Even that the criteria of the field is not met, the attendee can be edited