Please re-calculate the 6 months adjustment as the credit is very small as the water was for 22.6 (678 days) months if we divide 50972.99 by 22.6 it gives 2255.44 . therefore 2255.44 *6 = 13532.64 (this is the amount we should have billed and credit the difference) we need to see the journal and also reverse the interest as well.