an alpha-L-Fuc-(1->2)-beta-D-Gal-(1->3)-alpha-D-GalNAc derivative + UDP-N-acetyl-alpha-D-galactosamine = an alpha-D-GalNAc-(1->3)-[alpha-L-Fuc-(1->2)]-beta-D-Gal-(1->3)-alpha-D-GalNAc derivative + UDP + H(+) — reaction