(1) If, due to a request for an extension of time by an obligor, a hearing decision cannot be rendered within the 45 day time provided for in 40-5-414 (6), MCA, (unless the appropriateness of withholding to pay current support is at issue), the withholding of income to pay current support shall commence on the day the extension of time is approved by the hearing officer. In such case, withholding to pay the alleged delinquent portion will not commence until after the hearing has been conducted and it has been determined what amounts are properly due and owing.