Hi,

If the check number is incorrect, you could do an accounting cancelation on the check and redo using the correct number.

So we did the accounting cancellation however, the system does not let us edit the check number. Does that mean this entry is invalid and we have to create a new one?

My understanding is that X3 assumes you actually printed a check document that corresponds to this record. I'm not aware of a way of modifying it (aside from via SQL). If you void this record then X3 assumes that the printed check document is voided also and a new check document / number is required.

The next check number is configurable by bank account here;

Common Data-> BP Accounting tables-> Bank Account.