When reissuing consolidated gift receipts it will produce an incorrect receipt number if the field receipt number is available in fields to include. The field doesn't need to be used in the document just available.
When using reissue receipts in Mail for consolidated receipts the receipt number will be incorrect if receipt number is included in fields to include. This issue doesn't affect individual gift receipts. If you produce an incorrect receipt number you can delete this from the database and then remove receipt number from fields to include leaving and using instead the field printed receipt number.
Note this only affects consolidated receipts and not individual gift receipts