Spec code D48 takes the extended price of the item, subtracts any applicable discount, and adds the tax. Will this work for your situation?
Adagio OE has an 'all specification codes' document that you could choose to preview against a live order or invoice or credit note to determine which spec code prints the amount or information you are looking for. The spec title will be something like 'OE ALL codes to July 2009' or some similar date.
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Softrak Tech Support