AND or OR gene - protein logical relation in KEGG
The enzyme EC:1.6.1.2 is an NAD(P) transhydrogenase and consists of two subunits. The two subunits are encoded by two different genes pntA and pntB.

So in terms of computer logic I would say AND, both subunits are necessary for a functional NAD(P) transhydrogenase enzyme (EC:1.6.1.2).