Delegated resellers plan missing allowed upgrade/downgrade plan paths.
Allowed upgrade/downgrade plans were added later than this plan was delegated. Upgrade paths that are added later are not delegated even if the reseller is synchronized. There is a feature request with id #PBA-66622 ("Synchronize plan upgrade path") to make such synchronization possible.
Refer to kb #127649 for the list of objects that are synchronized.