How can I correct an incorrect date in prorate convention

     When the prorate conventions were set up, someone inadvertantly set the half-month 12/15/14 to 12/31/14 with a prorate date of 1/1/14 instead of 1/1/15.  Is there any way to correct the prorate date on the assets placed in service in this time period?  We have not closed the period in assets yet.  ANY HELP would be greatly appreciated.  We are running EBS 12.1.3