*/
BillableReceipt addReceipt (final BillableReceipt receipt) throws ReceiptAlreadyAddedException;
+ /**
+ * Checks if given receipt is already persisted by checking receipt number
+ * and branch office combination.
+ * <p>
+ * @param receipt Receipt instance
+ * <p>
+ * @return Whether the receipt has already been registered
+ */
+ boolean isReceiptRegistered (final BillableReceipt receipt);
+
}