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I just posted this bug on connect.microsoft.com - there is an issue when you use unary operator in a parent-child dimension combined with a many-to-many relationship.
The problem is that the '+' operator on non-leaf nodes seems to not consider the children value and bypass the intermediate measure group. Everything works well with the '-' operator. It sounds like an optimization that has a side-effect...
I found the bug thanks to a post on www.sqlbi.eu forum, that is starting to get feedback from people who are using the models described in the Many-to-Many Revolution paper.
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About Marco Russo (SQLBI)
Marco Russo is a consultant, writer and trainer specialized in Business Intelligence with Microsoft technologies. He runs the SQLBI.COM website, which is dedicated to distribute resources useful for BI developers, like Integration Services components, Analysis Services models, tools, technical information and so on. Marco is certified as MCT, MCDBA, MCSD.NET, MCSA, MCSE+I.