in fact only these 2 files need to be changed:
invoice.product-tab.tplinvoice.total-tab.tpl
thx eleazar
in fact only these 2 files need to be changed:
invoice.product-tab.tplinvoice.total-tab.tpl
thx eleazar
in fact only these 2 files need to be changed:
invoice.product-tab.tplinvoice.total-tab.tpl
thx @Eleazar