[invoice] render tax/tax number into 'our-details' section

gnucash/report/business-reports/invoice.scm

@@ -729,6 +729,7 @@ for styling the invoice. Please see the exported report for the CSS class names.
          (fax (gnc:company-info book gnc:*company-fax*))
          (email (gnc:company-info book gnc:*company-email*))
          (url (gnc:company-info book gnc:*company-url*))
+         (taxnr (gnc:option-get-value book gnc:*tax-label* gnc:*tax-nr-label*))
          (taxid (gnc:company-info book gnc:*company-id*)))
 
     (if (and name (not (string-null? name)))
@@ -766,6 +767,11 @@ for styling the invoice. Please see the exported report for the CSS class names.
                                            (gnc:make-html-div/markup
                                             "maybe-align-right company-tax-id" taxid))))
 
+    (if (and taxnr (not (string-null? taxnr)))
+        (gnc:html-table-append-row!
+         table (list (gnc:make-html-div/markup
+                      "maybe-align-right company-tax-nr" taxnr))))
+
     table))
 
 (define (reg-renderer report-obj)