Not to excuse the attitudes of any agents but voluntary changes to a reservation with confirmed systemwides is not for the faint of heart on either end of the call!

The TLDR of this is that there is reprice involved but you wanted to keep your confirmed systemwide space on the long segments and you had found inventory in the lower cost O bucket that the agents couldn't pick up (but that they provided some common reasons why they couldn't find it which aren't likely the cause in your scenario).

Your J example might not apply here as oversell limits are common on certain routes but with O7, that says that something else was at play here unrelated to temporarily holding space in pricing screens.