Hemat saya, merujuk gaya birokrasi Indonesia, selain ada pengumuman pemenang (announcement of procurement/tender winner), masih dibutuhkan dan/atau akan diterbitkan surat penunjuk(an): Letter of Appointment/Appointment Letter.

Procurement Committee shall deliver Minutes of Auction Result (BAHP) to Commitment Official (PPK) as a basis for issuing Letter of Appointment as Provider of Goods/Services (SPPBJ). ...
Letter of Appointment as Provider of Goods/Services (SPPBJ) shall be issued in no less than 6 (six) workdays following the announcement of auction winner, if there are no refutations.
(Procurement Committee of Completion Centre (Cabin Interior and Self-Defense System) of Boeing Business Jet 2 Aircraft of The Ministry of State Secretariat of the Republic of Indonesia

Appointment/announcement of tender winner as determined on the basis evaluation of bid price and technical considerations; and g. Allowance for challenge to ...
https://books.google.co.nz/books?id=AC3O0S-J_RwC&pg=PT24&lpg...

Subsequently, the initial requirements to obtain the above permits or licenses are as follows:
1. Letter of appointment from the parent company;
...
In order to conduct its activities, the trade representative office must have a Foreign Representative Office Trade Business License (Surat Izin Usaha Perwakilan Perdagangan Asing “SIUP3A”), which is valid for a maximum of three years unless otherwise specified in the appointment letter, and can be renewed in conformity with the appointment letter.
https://www.jurists.co.jp/en/publication/tractate/docs/11120...