Hi, Mari,
Can you change the 'Check number' field to add a character to the end of the cheque number, perhaps an A? When you tab out of the field, the 'Bank reference' field will change as well.
Or, In the Company Profile on the Options tab, there is an option to 'Check for duplicates?. If you disable this, you will be allowed to post the batch. However, you might want to turn it back on again unless you always want to allow duplicate cheque numbers.
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Regards,
Softrak Tech Support