Hi Anna - not too sure how this could have happened. Perhaps the same reference numbers were used in the Payments as well as the Receipts part of the Cash Book. If this was the case then it is best to use a letter in front of the number - for example P1035 for a payment and R1035 for a receipt.
The only other thing that I can think of is that the reference numbers had been used on a previous occassion ... perhaps in an earlier month.
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