You want to know how to create a report to pull up only Competitor Product data and you also want to know which data source to use to achieve this requirement.
In order to create a report which would show only Competitor Product data, you can use the data source Master Data Source for Competitor Products (technical ID COMPETITOR_PRODUCT_B). If you use the data source Product Master Data (CODPRODUCT), you need to maintain a default value selection for Competitor Product. Please refer to the attached word document which explains in detail about maintaining default value selection for Competitor Product.
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