Date/Time:
06/17 4:15PM EST

Frequency:
Always

Character Name:
King Canadane

Race:
Miqo'te F

World:
Hyperion

Class/Level:
GSM 50

Area and Coordinates:
Ul'dah - Steps of Nald (8,9)

Party or Solo:
Party with Chocobo

NPC Name:
Flame Personnel Officer

In-Game Time:
Multiple times

Steps:
Grand Company asks for the item "Electrum ear cuffs". I make a HQ for intent on handing in.
I have noticed that items with materia in it are worth more seals, so I meld a "Strength Materia I" to the ear cuffs and proceed to hand it in.
I am prompted with a confirmation if I want to turn in an HQ item. I select yes.
I am prompted with a confirmation if I want to turn in an item with materia in it. I am unable to select yes, no, or even close this window.
At this point my inventory is automatically closed and the supply window is returned, while the prompt doesn't go anywhere. The only way to remove the prompt was to exist the supply/provisioning mission window.

I have handed in materia melded items before. I have handed in HQ items before. This was my first attempt at doing both. I proceeded to attempt multiple times but was unsuccessful and in order to complete the mission I had to make another pair of Elecrum ear cuffs. I HQ'd them, did not meld materia, and handed them in without issue.