Well, the short answer is that Timeslips does not charge interest on No Charge slips. It doesn't charge interest based on slips at all. It calculates it based on the Aged Balance of the Invoice. It does not care which slips made up the invoice charges. You can see exactly how Timeslips is calculating interest if you run a PreBill Worksheet. I suspect it is because it is trying to charge interest for March 7 thru March 22 since you have a Zero Grace Period. But, I would check the worksheet first.
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