There is quite a few differences in between CV and PT which are better to be aware of.
Though both require a minimum of 2 person (pendiri) to create it, the CV is strictly reserved for Indonesian citizen and 100% of its capital must be indonesian, while the PT can be created by a foreigner an it’s capital can be own by a foreign investor in part or in totality. It is then called a PT PMA.
A CV is a simple business entity (badan usaha) very lightly regulated by the indonesian commerce code (KUH Dagang) while a PT is a legal corporation (badan hukum) which is regulated by its own statute (Undang-Undang nomor 40 tahun 2007 tentang Perseroan Terbatas). A PT, being a corporation has legal rights and is an entity separate from its owners, who have a limited liability (their liability is limited to the capital invested). It is very different, in this regard, from a CV which is much more like limited partnership or sole proprietorship companies with a full liability of the pesero aktif/direktur who has to assume debts and obligations of the CV, even on his/her private property (pesero aktif adalah orang bertanggung penuh melaksanakan kegiatan perusahaan, termasuk kerugian yang harus ditanggung oleh harta pribadinya). This is something to be fully aware of if one is married with an Indonesian citizen who plans to create a CV. There is implications that must be thought of. Caveat emptor.
A PT has it's capital divided in between it's shareholders. A CV, generally belongs to one pesero aktif (direktur) who owns the totality while the komanditer/pesero pasif has no or little power. He is often just here because the law says that there must have 2 persons...
Also, a PT has a capital of minimum IDR 50.000.000 (25% of which must be available at the creation of the PT) and mention of it must be done in the akta pendirian of the PT. Any change in the capital must be reported and have the approval of depkumham (PT) or BKPM (PT PMA). A CV has no such obligations, no minimum of capital and no need to mention it to Depkumham. It is only mentioned in its Surat Izin Usaha Perdagangan (SIUP). It doesn’t mean however that a CV is necessarily a small company. It ain’t rare to bump on a CV with a capital superior to the one of quite a few PT.
Administratively speaking a CV is much more flexible and light than a PT. However, a certain number of sectors are closed to CV and a PT is therefore an obligation if your targeted business is in one of these sectors. Don’t expect to create an airline company or a banking institution, for example, with a CV, it won’t lead you anywhere. A CV is more for a local use/field of action and more suitable for what we call UKM (Usaha Kecil dan Menegah). It requires only a registration to the local Pengadilan Negeri (beside the obtention of a SIUP & a TDP) and no approval from the minister of Justice and Human Rights. Also, a PT must have it’s name approved by the minister and can’t have the same or a similar name of any other PT throughout the archipelago. This is different for a CV. Pick a name you fancy, go to see a Notaris and that’s it. Call yourself CV Garuda, CV Kokakola or CV Gratillaisgonnasaythatmypostistoolong and you will be able to do bisnis with no trouble. The administrative lightness of the CV compare to a PT results in a difference of cost at its creation or to operate it. With 3 millions, maybe less, I would get you a ready to operate CV in 10 to 15 days in Manado, including the akta pendirian (the most expensive), the surat Keterangan Domisili, the NPWP, the SK-PKP, the pendaftaran PN, the SITU, the SIUP and the TDP. A PT, managed alone, would cost you twice this amount or even more if you deal with an "agent" and would take you close to 2 months maybe.
Last, CV stands for Commanditaire Vennootschap (sorry it’s dutch) or more poetically Persekutuan Komanditer / Perseroan Komanditer in Bahasa Indonesia, while PT stands for Perseroan Terbatas (limited company in English).
I hope it has clarified it a bit, despite the length of the post.