gistfile1.txt

/// <summary>	
/// Class extensions should have an Extension suffix, and should include the name	
/// of the extending model as an infix to maintain uniqueness.  The extension class	
/// must be marked as final as it would make no logical sense to subclass 	
/// or extend an extension.	
/// </summary>
[ExtensionOf(classStr(CustTransSettlement))]
final class CustTransSettlement_MyNewModel_Extension
{
    protected boolean isTransTypeValidForInsertSettlementLines(CustTrans _custTrans)
    {
        //We must always call the next handler in the Chain of Command (CoC) even if 
        //we really don't wan't or need to.  
        
        //The only guarantee about sequence is that the standard version will run last.
        
        next isTransTypeValidForInsertSettlementLines(_custTrans);

        //Override the standard result with our own logic, but put the logic somewhere else 
        //to keep this method assimple as possible to protect against future
        //framework changes.
        
        return MyOtherClass::SomeOtherMethod(_custTrans);
    }
}