Need Advice with Parameters (Allowing no selection)

  • I have a couple of parameters I've added to a report I'm developing. The first is for Collection Operations and the second if for Organization Sub Centers. Collection Operations belong to a Sub Center, which in turn belong to an Organization Center.

    For instance, Collection Operations 1, 2, and 3 belong to Sub-Center A while Collection Operations 4, 5, and 6 belong to Sub-Center B.

    How can I enable the report to accept a NULL value or no selection at all if the user selects a value from the Sub-Center parameter? I cannot select "Allow null value" in the report parameter because I also want the user to be able to select multiple values.

    Suggestions?

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