Hi Susan,
When I set the Receivables company profile for the 'calculate base for discount with tax included' to a particular setting (either with or without tax), it is correctly determining the discount base when the invoice is created. I used a tax-included distribution on the invoice to see.
Note that changing the company profile option will not recalculate the discount base to include or exclude tax. If you have an unposted invoice and change the company profile option, you can force a recalculation by editing and saving the invoice in the batch. Posted invoices cannot have the discount base recalculated.
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Regards,
Softrak Tech Support