When vacation codes are grouped together, the group label is shown on the bid, but the individual codes are not. Individual codes are shown on your calendar. If a Vacation code belongs to a group, the group label is always shown on the bid option even if only one type of vacation is assigned. However, the individual code is shown on your calendar.
Example
Set Condition Slide Vacation CVAC Dec 3, 2009
Only the first date of the vacation is shown on the bid.