Extension of LedgerJournalDP and breakpoints in class not working

Hi,

I have worked with different report extensions and they are working fine. But today I get chance to work with LedgerJournalDP and unfortunatly its estension is not working. I tried to put break points in class LedgerJournalDP but they are also not working. I have load all symbols and breakpoint get red, but not worked. 

 Actually I need to make some changes in Payment Journal print. Please help if I am making some mistake. Here is the extension code. The code is just specimen.

[ExtensionOf(classStr(LedgerJournalDP))]
final class My_LedgerJournalDP_Extension
{
    public void processReport()    
    {        
        next processReport();
        ;
        Info("I am here to work further");
    }
}