Hi, Jing,
Did you delete any values that were in the Starting range, so that the Starting value is 'blank' and, in the Ending range fields, did you type a 'z' and hold the key down until no other zeds will print on the screen? Some of the fields require a different number of zeds in the Ending value fields than others.
Also, did you look in the 'Choose balance by' section and make sure that there is no 'checkmark' in the box next to 'Select customers based on balance'?
Are the values for 'Customers with balance between' zero and 9999? Is the 'Debit minimun' zero?
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Regards,
Softrak Tech Support