After updating to office 2007 refman does not recognize the old references of a word 2003 document

After the updating office 2003 to office 2007 now I have problems with the refman 11 under office 2007. It works well, besides the problem that the refman 11 does not recognize the existing references in a word 2003 document opened in word 2007. Therefore all references must be reentered. After re-entering the references, everything works fine.