Refund Customer Transaction with Accounting rule

Mapping required:

Case:

I have AR Transaction of 1799 AED dated 01-Dec2013

Customer paid on the same day through check which is cleared by the bank also.

We are using Accounting rule for 8 months from 01Dec-2013 to 01-Jul-2014.

On 01-Feb-2014 I need to make refund to Customer.

Requirement:

I dont not want to change the orignal receipt.

Need to credit sales but as revenue is spreaded from 01 Dec 2013 till 01 Jul 2014. Need to reverse revenue after 31-Jan-2014 also.

Amount need to refunded(Feb+Mar+Apr+May+Jun+Jul(1day) = 1257.34

Revenue distribution created by the system:

Period	days	Revenue as per days
Dec