The best report for who owes you money is your Aged A/R Balances report. But, I don't think you can filter an Aged A/R Balances report by a slip criteria. However, you could run it filtered by a Last Bill Date field. Meaning you last sent them a bill on X date. So filter the Aged A/R by Client Last Bill Date 18 months ago or later and you should get only clients who have gotten a bill from you in the last 18 months, which should be your recent billings. Hope that helps.
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