means inability to work owing to any sickness or injury other than sickness or injury caused by an employee’s own misconduct: Provided that any such inability to work, caused by an accident or scheduled disease for which compensation is payable under the Compensation for Occupational injuries and Diseases Act, 1993 (Act No. 130 of 1993), shall only be regarded as incapacity during any period in respect of which no disability payment is payable in terms of that Act.