That is because that is no longer a valid code. Have you looked at the Schedule C Instructions?

Nonstore Retailers
Nonstore retailers sell all types
of merchandise using such
methods as Internet, mail-order
catalogs, interactive television,
or direct sales. These types of
Retailers should select the PBA
associated with their primary
line of products sold.
For example, establishments
primarily selling prescription
and non-prescription drugs,
select PBA code 456110
Pharmacies & Drug Retailers.

https://www.irs.gov/pub/irs-pdf/i1040sc.pdf#page=18