Materia melding reporting that the Armorer's Visor is too low for Craftsman's Cunning

Time: 2AM, MT Sept 1st 2013
Frequency: Persistent
World name: Balmung
Character name: Rathe Vrilvor
NPC name: N/A
Monster name: N/A
Class/Level: Armorer 50
Party or solo: Solo
In-game time: N/A
Area and coordinates: N/A, but only tested at Bonfire near Black Brush and Ul'dah
Steps:
1. Select Materia Melding II (obtained from legacy status, quests were not completed beforehand) from actions list
2. Find Armorer's Visor (NQ) in gear list
3. Choose to meld Craftsman's Cunning II, III, or IV
4. Feedback on confirmation screen indicates that "The selected item's level is too low to maximize the materia's potential" and is lowered to +1 CP, despite the item level being 55 and the materia's tooltips indicating this would be meldable
NOTE: As I have no additional materia to test with, it is unknown if this is due to the materia or Armorer's Visor. However, I have checked (but not completed to meld) the Craftsman's Cunning on a Cobalt Visor, Kite Shield, and Cobalt Cuirass and they all report that it would function at full power.

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This is working as intended (I'm 99% certain, anyway), but the displayed text is wrong and misleading.

If a piece of equipment already has bonus to a certain stat (be it by default on the item, or through other materia), then melding materia which is to improve that same stat will yield a lower return, eventually reaching 0.

You can check for yourself, taking your Visor as example.
It has by itself CP+ and Control+, so if you try to meld Craftsman's Cunning (CP+) or Craftsman's Command (Control+) materia to it, you'll notice that you won't get the full bonus.
If you try to meld anything but those two, however, the item will receive the full bonus.

Huh. Also, FFFFFFFFFFFFFFFFFFFFF

Now my math's off and i'll have to figure out how to do this again. I'll test it once I got my hands on Craftsmanship+ materia.