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BKColumnList is a comma separated list of the fields that make up the business key or natural key of your dimension. The sample uses a single field (Product_Nbr) as the business key. However, dimensions may use a composite business key. For example, the business key of the sample dimension could have been the combination of Product_Nbr and Product_Name, in which case the value of BKColumnList would be "Product_Nbr, Product_Name".