I don't make the rules. From AA's Pilot Credentials Q&A:

Q: What are the differences between PIC, SIC and Instructor Time when logged into the Flight Hours?

A: Here are the guidelines:

PIC (Pilot In Command) = Any time you signed for the plane as aircraft commander or solo including all instructor time.

SIC (Second In Command) = Any time you acted as second in command and/or didn't sign for the plane.
*This DOES include dual/student time.

Instructor = Only the time you logged as an instructor, regardless of the time being reported in PIC.

Instructor time is PIC time. It belongs in both columns.