If they were agreed beforehand, the person making the application would have said so. Installment order amounts are generally just an amount the creditor asks for. Sometimes the debtor and creditor come to an arrangement before the court date, in which case the creditor will simply ask for the sum agreed. If the debtor does not agree, it is up to them to come to court and be examined as to their means to see if they can or cannot afford such payments. If they don't turn up, the judge does not have the opportunity to give them a hearing, so the creditors application will be granted unopposed.