Login or register (free and only takes a few minutes) to participate in this question.
You will also have access to many other tools and opportunities designed for those who have language-related jobs (or are passionate about them). Participation is free and the site has a strict confidentiality policy.
Actually, I believe this baixa refers to having something approved or finished with. As I have found the same term in the same document in a different context:
Envia baixa do peso das programações de expedição
Expedição = shipping
It might be the wagons have to be weighed to check any weight decreases, I just haven't thought about that...