If the court finds that the debtor is able to pay the judgment in full or by partial payments, from time to time, it shall, after first allowing the debtor out of his or her income a reasonable sum for the support of himself or herself or the support of himself or herself and family, if he or she has a family, enter a decree fixing the time, place, and amount of payments to be made by the debtor on the judgment out of his or her income in excess of the allowance. If the court entering the decree finds that the debtor is not able at the time to pay the judgment in full or by partial payments, from time to time, it shall enter a finding to that effect which shall be subject to revision on like notice and inquiry and on proof of changed circumstances of the debtor; but no subsequent citation to the debtor shall issue until the creditor or some one in his or her behalf has filed in court an affidavit setting forth evidence of such a change in the circumstances of the debtor as shall satisfy the court that a new inquiry as to the debtor’s ability to pay the judgment shall be made.