Trying to add a new statement sheet number and I am getting the error - 'New Statement number cannot be before the most recent'

On the statement reconciliation the system expects that Statement Sheet Number will be increasing/moving forward.
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Therefore if for example you entered 31052023 for one statement the next number will need to be a higher number than that, you will not be able to enter 30062023 as that number is lower, so the next number the system will accept in this example would be 31052024.