Incorrect Price on Return Line (Credit Memo)

Hello, I have a sales order with the following details:

unit selling price 23.28

total amount: 127,946,88

it needed to be returned due to incorrect pricing, it should be 23.27. So I return the order via Credit Memo.

during Returning the order, I mistakenly put the new price on Return Line instead of Copy Line so it resulting in different amount: -127.891.92 and the order already been booked before I realize it.

so now I have a un balanced order here,

  

Trx Type	Unit price	Line Tot
Finish Good_Export	23.28	127,946.88
Credit Memo	23.27	-127,891.92

I've tried to adjust the Return Order price manualy but it said that 'No manual discount available'