The Short Version
The official, constitutionally ratified Pancasila lists "Persatuan Indonesia" — Unity of Indonesia — as its third principle. This is confirmed by multiple authoritative Indonesian government sources (BPIP, KPU) and independent international references (USCIRF, EBSCO). An earlier draft by Sukarno on June 1, 1945 used a different ordering, but that proposal was superseded by the formulation enshrined in the 1945 Constitution's Preamble, which is the universally recognized standard.