This specifies a list of successor profile IDs. If this is given, only plans where any of the specified profiles is an active successor are returned. Each ID may be numeric or encoded. For user-token (JWT) callers, the request fails with a 403 if the caller does not have manager or HRBP access to every specified profile, and the returned plans are limited to those the caller is allowed to view; totalCount then reflects the number of plans returned on the current page after view-access filtering, not a global count to paginate against. The format should be comma-separated values with or without spaces (ex. 1000,2000, 3000).