| ⇢ | A | EnrollmentCannotBeDeleted added | |
| ⇢ | A | UserIsNotEnrolledInCourseException added | 
| ⇢ | A | Student::getEnrollmentWithShiftByCourse() added | |
| ⇢ | A | Enrollment::hasShift() added | |
| ⇢ | A | EnrollmentCannotBeDeleted::__construct() added | |
| ⇢ | A | EnrollmentCannotBeDeleted::getEnrollment() added | |
| ⇢ | A | UserIsNotEnrolledInCourseException::__construct() added | |
| ⇢ | A | UserIsNotEnrolledInCourseException::getCourse() added |