If you entered a figure that was too big you have to "re-post" the difference between what you have entered and what it should have been. The amount that was too much must be drawn out again.
If on the other hand you entered a figure that was too small you now have to make an additional entry of the difference between what you entered and what it should have been.
You have entered the shop sale at $ 970 but find out that it should only be $
950. Then you have to credit (take out) the difference of $ 20 in the
Cash/Bank-Account because here you debited the $ 970 which was 20 too much.
And you have to debit the $ 20 on "Shop Purchase-Account" because here
you credited the $ 970.
In the text you say which voucher you are re-posting so that it is possible to
track the re-posting.
If you make an additional posting you also mention the original voucher number
in the text.
I have no use for bodyguards, but I have very specific use for two highly trained certified public accountants.
- Elvis Presley, American singer