Linking an SRSS report - Dropdown parameter not getting passed

Sorry if this is a duplicate post, not sure what happened with my original one.

I have a linked SSRS report (Report A) that links to Report B. One of Report B's parameters is controlled by a Dropdown/ComboBox. In the parameters dialog box that gets launched from the navigation tab, I have tried both 'VALUE' and simply putting VALUE without the single quotes.

Both ways result in an error stating that the parameter was not provided. Ho开发者_如何转开发w do I correctly pass this value, so that Report B will recognize it?

Thanks