ANSWER
According to Peraturan Pengawasan Klaim Dalam Label Dan Iklan Pangan Olahan (Nomor HK.03.1.23.11.11.09909 Tahun 2011), inulin can be placed under the category of other functions claims and disease risk reduction claims as per the following:
All products including products that contain active ingredients like inulin must be registered with the Badan Pengawas Obat dan Makanan (BPOM) accordingly.
According to Peraturan Pengawasan Klaim Dalam Label Dan Iklan Pangan Olahan (Nomor HK.03.1.23.11.11.09909 Tahun 2011), prebiotic claim is not allowed for inulin and calcium absorption claim is also not allowed for inulin-oligofructose mixture. Pre-approval of the claims from BPOM is needed.
Reference
Badan Pengawas Obat dan Makanan Republik Indonesia (2011). Peraturan Pengawasan Klaim Dalam Label Dan Iklan Pangan Olahan (Nomor HK.03.1.23.11.11.09909 Tahun 2011).