KBLI 2025 is legally effective and is now the reference point for business activity classification in Indonesia. For many PT PMA owners, the first friction is an OSS block caused by business scale settings applied to specific five-digit KBLI activities. This article explains how scale gating works, why PT PMAs meet it early, and how to run a controlled KBLI 2025 update for an existing NIB, including licensing dependencies, investment field conditions, and practical remediation steps.