Correct improperly received payment
The client I do bookkeeping for has a client who was charged $70 for a service on March 9, 2020. This amount did not show up in QB when I went to reconcile so I dug deeper and I found that the payment was made and dated for March 28/2018 for some reason. It was also a payment for $100 so there was a credit for $30 even though she actually paid $70. I checked the register and this payment of $100 was deposited on March 29/18 and it doesn’t show up at all anymore so it must have been reconciled. I'm not sure how to correct this without messing up previous reconciliations as this $100 does not show up on the reconciliation, even with the 2018 date. The deposits are typically done in groups so this one was in a list of other payments received.
Maybe it was the original invoice from 2018 that was accidentally changed and dated 2020 (perhaps the original was intended to be copied but was changed instead). I'm still unsure why the amount was $100, the client now has a $30 credit, which isn't accurate. I'm not sure what to do in this situation in order to get through the next reconciliation. Please help!