Have you ever wanted to filter a tablix using an OR clause. The interface is a little confusing, but the steps below will accomplish this.
1. Open Tablix Properties
2. Add Filter
3. Set Filter Expression: =(Fields!MyTagName.Value = "value1" OR Fields!MyTagName.Value = "value2" OR Fields!MyTagName.Value = "value3")
4. Set Filter Expression Type: Boolean
5. Set Filter Operator to '='
6. Set Filter Value = 'True'
That should do it.
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