In Report Builder 3, if you filter on a field and then chose to make that field a prompt (and the ValueSelection is set to dropdown for the field in the report model definition) then a hidden dataset and parameter will automatically get created for you. The parameter's list of available values will point to the newly generated hidden dataset. The newly created hidden dataset will include the single field that you are filtering/prompting on. The results of this hidden dataset will return the data - not sorted. To get it to sort, edit the query for the hidden dataset and add the same field to the query - this will cause the semantic query engine behind the report model to include an order by clause on the field which will return the data sorted.
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