In Workflow 2007 using the Query List action I'm trying to use workflow constants for the Site URL and in my CAML query I'm trying to use a workflow constant for the List ID. This is so I can develop in one environment and import into another. I receive the error "Failed to query list data. Data at the root level is invalid. Line 1, position 1.". If I hardcode the workflow constant values in the Site URL and CAML query for List ID all works as expected. Should I be able to use the workflow constants in the Query List action?