Can You Credit Just Sales Tax on a Customer's Invoice in GP 2010?

Is it possible to credit just the sales tax on a customer's invoice in GP 2010 instead of a full credit and re-bill? If the customer is charged tax and they are exempt, I would like to just be able to adjust / credit the sales tax only from the invoice and not do a full credit and re-bill. Can this be done and if so, how? Appreciate any help.

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