I have a quick bill from August 2022 that was just paid by a customer.  I charged Sales tax on this invoice and they are sales tax exempt.  Therefore I want to post their payment but they did not pay the sales tax.  I do not understand the directions on how to adjust an AR invoice that includes tax.  When the adjustment box opens I am unsure what I am supposed to put in the amout box.  When I hit distributions I do not understand what to do???  This Invoice is $2543.80 with tax of $127.19.  I want to remove the $127.19.  Please help.  Thank you!