Editing MLA to remove empty "vol." entry

Hello,

For some reason a number of entries using CWYW in Word 2007 include an empty vol. entry at their end. So, for a book or citation that has no volume, the end of the citation reads “… vol.” I can’t for the life of me figure out how to get it to suppress inserting the volume into these entries, especially as the lack of a volume in the initial reference should be enough of an indiciation not to insert anything, but who knows.

Anyone have any ideas?

Thanks.