(2) When the sentence is imposed, the sentencing judge shall indicate on the record the reasons for the departure and shall impose, in addition to the indeterminate sentence imposed under ORS 161.725, a required incarceration term that the offender must serve before release to post-prison supervision. If the presumptive sentence that would have been imposed if the court had not imposed the sentence under ORS 161.725 and 161.735 as a departure is a prison sentence, the required incarceration term shall be no less than the presumptive incarceration term and no more than twice the maximum presumptive incarceration term. If the presumptive sentence for the offense is probation, the required incarceration term shall be no less than the maximum incarceration term provided by the rule of the Oregon Criminal Justice Commission that establishes incarceration terms for dispositional departures and no more than twice that amount. However, the indeterminate sentence imposed under this section and ORS 161.725 is not subject to any guideline rule establishing limitations on the duration of departures. [1989 c.790 §77; 1993 c.334 §6]