fix: actual tax conversion in case of multicurrency invoices (#28539)

diff --git a/erpnext/public/js/controllers/transaction.js b/erpnext/public/js/controllers/transaction.js
index 0cfc008..773d53c 100644
--- a/erpnext/public/js/controllers/transaction.js
+++ b/erpnext/public/js/controllers/transaction.js
@@ -1106,7 +1106,7 @@
 		$.each(this.frm.doc.taxes || [], function(i, d) {
 			if(d.charge_type == "Actual") {
 				frappe.model.set_value(d.doctype, d.name, "tax_amount",
-					flt(d.tax_amount) / flt(exchange_rate));
+					flt(d.base_tax_amount) / flt(exchange_rate));
 			}
 		});
 	}