ReportParam in SSRS

See:

That example actually adds fields that filter the data retrived by the RDL. You only need to include the CallContext table.

Basically 2 setps:

  1. Customize the form and and a text box bound to CallContextBPMData.Character01

  2. Then in the RDL, add to the dataset’s query expression:
    + " JOIN CallContextBPMData_" + Parameters!TableGuid.Value + " T2"
    And add the Character01 query field to the dataset.