Your credit facility is subject to a debt clearance requirement. Before the end of the debt clearance period, you must have fully paid off the outstanding balance on your credit facility at least once so that the outstanding balance comes down to zero. That's why it's called 'debt clearance.' It is a statutory requirement under the consumer credit legislation.
If you pay off your spending in full each month, you automatically meet the requirement. If you spread repayment of your spending, you have to keep an eye out for the last day of the debt clearance period (the debt clearance date), which is shown on your billing statement and in KBC Touch.