Unable to upgrade Terpischore to ilvl119

Platform: Windows
Date & Time: Few months ago
Frequency: always
Character Name: Jahnu
Race: Hume
World: Asura
Main Job: Dancer
Support Job: i don't remember
Area and Coordinates: Port Jeuno
Party or Solo: Solo
NPC Name: Oboro

Steps:
1. After upgrading Terpsichore to 99 went to Port Jeuno and talked with Oboro
2. Traded Terpsichore to Oboro to begin the quest
3. Oboro accepted and asked me to trade him 300 Beitetsu
4. Every time i try to trade Beitetsu (any quantity) he doesn't take them.
5. Contacted a GM and he sent me here.
6. Oboro will allow me to upgrade other ilvl119 weapons i have, only Terpsichore have some kind of bug.

Greetings, Jahnu!

Thank you for your patience while your concern was being investigated, and we apologize for any inconvenience this has caused you. After thoroughly reviewing the matter, the development team has determined that you may want to try to trade the lvl 99 Terpsichore and the 300 Beitetsu at the same time to obtain the ilvl 119 Terpsichore. If you continue to experience issues with the trade, please resubmit the bug report with your details, and we will make sure to escalate your report to the development team for further review. Thanks again for your patience and understanding!

FINAL FANTASY XI Support Team