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Thanks for your post ... I try to substract 2 local variables AllTax - Tax calculated in the document <?xdoxslt:set_variable($_XDOCTX,'AllTax',../../Total_Extended_Price_WF_ID23)?> <?xdoxslt:set_variable($_XDOCTX,'Tax',../../Tax_Summary_Lines_Section_S8/Summary_Taxable_Amt_ID8)?> ... i tried a lot of thing like this…