SACS Classification section (compact, noncompact, slender) in according with AISC.

Hi there.

Could anybody explain me why SACS define "Noncompact" section class for PG1200x500x12x25. We have flange W-T ratio (b/tf) which equals 10.0 in according with AISC 1989, SACS has to define this flange as slender.

Could anybody correct me where I made a mistake?