How to refresh child revenue items rows for Opportunity

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I have a use case where I want to refresh child product lines for the opportunity. I am using the following groovy script to refresh the Opportunity View object but it is not refreshing the child revenue items.

optyVO.findByKey(key(optyId),1);

optyVO.clearCache();

optyVO.executeQuery();

The following line is returning  the ChildRevenue object but it is a RowIterator and does not have a executeQuery() method.

def newChildRevenueVO = ChildRevenue;

Does anybody know how to refresh the child records?