This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
The problem must be in the "NumberUtil.divideBigDecimal()" routine, or the "irDetail.getSentToPrQty()" or "part.getUomConversion()" methods aren't returning what you think they are. The solution you've been given is correct; running the following code gives "2" as the final answer: