Instructions for adjusting the rating / slope when a course is re-rated
When a course is re-rated, you should archive the old tees for historical purposes, and use the Duplicate link to create a copy which you can edit (by clicking the pencil icon) with the new info.
From this page you can Manage the Tees for a given course. If a set of tees has scores posted -- presumably they have the rating and slope when those people played. For this reason, you cannot change the rating, slope, or par information for a set of tees if their are scores in the system, as this will impact peoples handicaps. Presumably they played the course when that information was correct.
The preferred way to handle this is to archive the incorrect set of tees keeping that information for the historical rounds, and then duplicate the tees editing the copy to create a good set of tees.
FYI, changes to the tee box information are only used used in calculating the FairwayFiles index for a round when the score is added or edited and re-saved. Changing a rating or slope will NOT automatically cause handicaps to be adjusted using the new info. This is by design.