unable to override CalculationService in hybris version 5.7.0.4

Hi, I'm unable to override the DefaultCalculationService. I created the bean and added the alias as "calculationService",Still OOTB service getting called. I checked in older hybris version (5.5) where i'm able to override. I created bean like this

 <bean id="defaultXxxCalculationService" class="com.xxx.core.order.service.impl.XxxDefaultCalculationService"
         parent="defaultCalculationService"/>
 

Please help on this. Thanks in Advance.