Are you getting the #Multivalue error in the child report only when used as hyperlink or you also get when you refresh the child report with the 4 State values? Don't look like this is an issue with passing the parameter.
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Are you getting the #Multivalue error in the child report only when used as hyperlink or you also get when you refresh the child report with the 4 State values? Don't look like this is an issue with passing the parameter.