As per oracle Web Site it seems that with 9i (if you passed your first exam after sept 2002) we need to purchase at least one Oracle Instructor Led Training:

"Instructor-led class requirement for candidates starting on the Oracle9i DBA Certified Professional credential exam path."

However as said onlysimon I can't imagine that if you call Prometric they will refuse to book an exam for you.
Could you let me know if one of you recently get the full OCP certification without following any Oracle ILT's? If so is there any problem with this??

Thanks

Philippe