private bool IsAuthorizedToModifySpecialSalaryAdjustment(SpecialSalaryAdjustment adjustment)
        {
            var salary = DbContext.Salaries
                .FirstOrDefault(s => s.Id == adjustment.SalaryId);

            if (salary != null)
            {
                return IsAuthorizedToUpdateSalary(salary);
            }

            return false;
        }
        private bool IsAuthorizedToDeleteSpecialSalaryAdjustment(SpecialSalaryAdjustment adjustment)
        {
            if (IsAuthorizedToModifySpecialSalaryAdjustment(adjustment))
            {
                return true;
            }

            return false;
        }