Shabti Cuirass ehhancing duration enhancement is not working on reprisal.

[Martel]

Platform: Windows 7
ISP: Time Warner
Type of Internet Connection: CATV
Internet Connection Speed: 20 mbps
Date & Time: February 13th, 2014. 3:36 PM CST.
Frequency: Always
Character Name:Martel
Race: ElvaanM
World: Ragnarok
Main Job: PLD99
Support Job: BLU49
Area and Coordinates: Lower Jueno, (J-5)
Party or Solo: Solo
NPC Name: None
Monster Name: None

Steps:

1: Equip Shabti Cuirass.
2: Cast Reprisal.
3: Observe reprisal wear off in 60 seconds. It's normal base duration.

Shabti cuirass has the effect "Enhancing magic effect duration +9". When tested on other enhancing magic spells, this gave +9% to the duration of the buff. But when used with Reprisal, which is also enhancing magic, no duration gain was seen.