The reason for Adisucipto’s father insisted him entering STOVIA

because …

he was predicted to die young
Mbah Wiryo, Adisucipto’s grandfather, said that his grandson was like Palgunadi, a courageous and honest wayang character who dies young. That was why Adisucipto’s father insisted that his son goes to School tot Opleidings van Indische Arisen (STOVIA), a medical school for Indonesian during the Dutch Colonial Period, and become a doctor. However, Adisucipto’s determination to become a pilot was so strong that he dropped out of his medical school to enter the aviation school.
  Tanti : Dewi, why didn't you come to my wedding anniversary last night?