currency.properties supercede not working correctly

FULL PRODUCT VERSION :
java version "1.7.0_01"
Java(TM) SE Runtime Environment (build 1.7.0_01-b08)
Java HotSpot(TM) Client VM (build 21.1-b02, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
According to the java.util.Currency API: Users can supersede the Java runtime currency data by creating a properties file named <JAVA_HOME>/lib/currency.properties.

The example given works:
JP=JPZ,999,0

However, this does not:
JP=ABC,999,0

The above currency.properties file gives "JPC" as the currency code rather than "ABC".

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Create currency.properties file that looks like this:
JP=ABC,999,0

2. Check list of available currencies (Currency.getAvailableCurrencies())

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
List of currencies including "ABC"
ACTUAL -
List of currencies including "JPC"

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.util.*;

public class CurrencyTest {

public static void main(String[] args) {
for(Currency c : Currency.getAvailableCurrencies())
System.out.println(c.getCurrencyCode());
}

}
---------- END SOURCE ----------