Relist Items: Success

ebayid:82 Failure | ErrorCode:87 

ShortMessage:Invalid category. LongMessage:The category selected is not a leaf category.

The Category that the item is trying to be placed in is not a leaf category.  A leaf category is a category that is an ending point in the category tree on eBay.  You need to go one or more levels deeper in oreder to list this item.

You cannot list items in eBay in non-leaf categories