Been trying to buy the lakon type 7 buy trading type 6 + credits. When i confirm it takes takes me back to the starport services, still in my lakon type 6. Tried it again a couple of times in solo and open play, but unable to purchase it.
How much cash do you have on you? Is it just enough to afford it?
If so there was a bug (not sure if it was fixed) that meant that the discount in Jameson Memorial was only shown but not actually applied.
I have 14,176,000 + 2,388,000(lakon type 6 trade in). Have more than enough than, Tried out buying other ships by trading in lakon type 6 and it works.