Our payroll clerk used a 2005 date when transferring the payroll deductions to accounts payable.  The date should have been 12/31/04.  Is there any way to reverse this transaction or make a correction to the proper date?

I went into PR-H, entered the incorrect date of 01/18/05 put in the negative amounts (using the minus sign) in the Amount To Pay column clicked on Save and got the message: "No amounts are designated to transfer to A/P".  Am I doing something wrong?  
 

You are right, I confess when I tried, I didn't take it all the way through the process, I just tested to see if it would allow the negative number which it did.
 
You can enter AP Credit memo(s) to the vendor(s) involved dated in 2005 posting the distribution to the Payroll tax payable account.  Then enter them again as vouchers dated in 2004.  Take the credit memos to pay the 2005 vouchers and make the regular payment of the 2004 vouchers.