ALTER INDEX [MUTA_PI3]
ON [prd_00rpd_hrm].[hrm].[MUTA]
REBUILD
WITH
(ONLINE = ON,
FILLFACTOR = 90,
MAXDOP = 0)
PARTITION = 2;
From http://technet.microsoft.com/en-us/library/ms188388.aspx, it seems you need to move the PARTITION = 2 before the index options.