We have a report that in 2008 version of SSRS, we could not dynamically update one parameter (which is a text box) from another parameter (which is a drop down). Each time the drop down changes, the text box would update. it only happens when we first preview the report (in other words, the text box is updated by the drop down). If I change the textbox to a drop down, it works. But if I change it back to a text box (i.e. I no longer set Available Values to none), the text box only updates when first previewed.
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