Hi Patrick, A simple solution could be to build your update into a batch (processing only) report that would calculate this field. Eventually add a field to your customer ledger entry table (best table to use if you are not differentiating the calculation on the item no.'s) to mark if the sales invoices or credit memo's has been included in your calculation or not. You update this field to yes, when you run your report. It's very easy, if you have a little NAV development experience.
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