There are several business functionality factors that determine which one goes first. You need to understand first what new capability you want to implement in BW that requires BW upgrade. There were a few presentations on BW upgrade strategies at the ASUG BITI annual conference on October 26-29, 2003. I would suggest you do a web search and take a look at those presentations. One such presentation Session code: 406 - SAP BW 3.0B upgrade: Best Practices by Janet Hutchison from Weyth. Good luck.
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