foundation walls w/ RAM/Revit Link

When importing a RAM model into Revit; the foundation walls are deleted from the Revit model (even though I unchecked "walls" in the "select attributes to update" section of the importer dialog box. Is there a way that we can not have the walls brought in from RAM into Revit (or at least leave the Revit walls alone)?  The project was drawn first in Revit and the walls did export into RAM properly (all of the foundation is above 0'-0") . I am using RAM/Revit Link v2.4.2.0 and Revit Structure Suite 2009 build 20081118_1045.

Thanks, Michael