Reference type in Z39.50 search results

When searching the Alexandria library catalogue ( via its Z39.50 interface with RefMan, the imported references are all of the type “Journal”, although most of the works referenced are books. Is there a possibility to configure RefMan or the host so that the imported references have the correct type? Or can RefMan at least be configured to attribute to all imported references the “Book, whole” reftype? The catalog, which does contain quite some references to journal articles, is based on Virtua, the RefMan version used is 10. Any helpful hints would be much appreciated.