A/R Sales Tax RPT NonTable Sales vs Tax Exempt

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Does any one know how Sage handles sales tax.. we run the A/R Sales Tax report and we dont know why some of the invoices show up in the Nontaxable bucket and other in Exempt.. the example we noticed was both customers had an entry in Exempt field in there customer record.. only we did wondering about how does Sage allow alpha exempt data when it should be numeric.