diff --git a/kapital_bank/mapping.py b/kapital_bank/mapping.py
index 9e34594..03ee90c 100644
--- a/kapital_bank/mapping.py
+++ b/kapital_bank/mapping.py
@@ -459,12 +459,11 @@ 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)
-		# Use currency from: mapping row → txn dict → bank transaction currency → company currency
-		# NOTE: use bank_txn.currency (= GL account currency, matches the BT amount),
-		# NOT kb_currency (= the foreign currency from the bank API, may differ from BT amount).
+		# txn_currency = the currency the BT amount is denominated in.
+		# mapping_currency is a FILTER (which transactions this rule matches), NOT the amount's currency.
+		# bank_txn.currency = GL account currency = currency of deposit/withdrawal = correct.
 		txn_currency = (
-			mapping_currency
-			or txn.get("currency")
+			txn.get("currency")
 			or (getattr(bank_txn, "currency", None) or "")
 			or company_currency
 		).strip()