In what ways does the Organisation of African Unity (OAU) look like a Confederal type of Government?

A
Confederal type of government is a loose political arrangement in which autonomous or sovereign
states come together to form a union in which the functions of
government are reserved exclusively for the component states
with a weak centre.

• OAU is a union of organisation of
  sovereign states. 
• Major functions or
  powers of OAU are reserved exclusively for members states.
•  The organisation has a weak centre
  which is its secretariat.
•  The constitution of OAU did not
  reduce the powers of its member states rather they are very
  powerful.
• Member states have constitutional
  right to secede.
•  Citizens have to obey government of their own country
  and not OAU.
• Member states of OAU retain their
  own army and policy. 
• Member states of OAU retain their
  sovereignty and identity