Hi Alex, I appreciate your information. I will try your suggestion later. Meanwhile, I've changed my configurations: 1. Added New list (numbered list type) with some properties. The content is the same as Source Module 2 above. 2. Put the SUM function in the target module. My SUM function: Source module 1.Amounts [SUM: Product>Groups#.Group 2, SUM: Product>Groups#.Group 9] Error message: The dimension of mapping used for aggregation doesn't match any dimension of the source. Questions: 1. Could you see something wrong? 2. I've created the new list above to replace Source Module 2. Which one is a good solution (PLANS)? 3. You may give other thought. Regards, Andi
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