diff --git a/kapital_bank/mapping.py b/kapital_bank/mapping.py
index 504eb36..163f698 100644
--- a/kapital_bank/mapping.py
+++ b/kapital_bank/mapping.py
@@ -276,7 +276,11 @@ def _find_mapping_for_txn(txn, transaction_mappings, purpose_text_cache):
 	txn_party = (txn.get("party") or "").lower()
 
 	bt_name = txn.get("bank_transaction_name")
-	txn_kb_currency = (frappe.db.get_value("Bank Transaction", bt_name, "kb_currency") or "").strip().upper() if bt_name else ""
+	if bt_name:
+		_bt_cur = frappe.db.get_value("Bank Transaction", bt_name, ["kb_currency", "currency"], as_dict=True) or {}
+		txn_kb_currency = (_bt_cur.get("kb_currency") or _bt_cur.get("currency") or "").strip().upper()
+	else:
+		txn_kb_currency = ""
 
 	both_rules = []
 	purpose_only_rules = []
@@ -451,7 +455,8 @@ def _create_journal_entry_for_brt(txn, paid_from, paid_to, bank_txn, multi_curre
 		is_multi = from_currency != company_currency or to_currency != company_currency
 
 		currency_precision = cint(frappe.db.get_single_value("System Settings", "currency_precision") or 2)
-		txn_currency = (txn.get("currency") or company_currency).strip()
+		# JS does not pass currency; fall back to bank transaction's currency field
+		txn_currency = (txn.get("currency") or bank_txn.currency or company_currency).strip()
 
 		# Exchange rates: account_currency → company_currency
 		from_rate = 1 if from_currency == company_currency else get_exchange_rate(from_currency, company_currency, posting_date)