SC literally intercepts any input before sent to the game, which it then interprets to do whatever swaps it does. Literally, the problem here is instead of doing /pet "Sleepga" <t>, it's wanting to do /ma "Sleepga" <t>, which a SMN can't do unless /BLM of the appropriate level. I wouldn't be surprised if he can't use Blizzard IV from Shiva or other BPs that are spells, either. Looking at an Resources.xml I have here, Sleepga is indexed and ID'd as #273. The BP version is #174 and #611. He can try editing that to see what happens.
BLM Version:
<entry recast="30" casttime="3" mpcost="38" skill="EnfeeblingMagic" targets="Enemy" element="Dark" type="BlackMagic" japanese="スリプガ" french="OmniSommeil" german="Schlafga" english="Sleepga" prefix="/magic" index="273" id="273"/>
SMN Version:
<entry recast="0" casttime="0" mpcost="54" skill="Ability" targets="Enemy" element="None" type="BloodPactWard" japanese="スリプガ" french="OmniSommeil" german="Schlafga" english="Sleepga" prefix="/pet" index="174" id="611" tpcost="-1"/>
Ultimately, though, fixing this is something he should be trying to do on their forums.
Edited, Apr 29th 2012 2:08am by Seriha