This situation requires you to be proactive to avoid any complications during the admission process.

• Find the contact details for the institute or exam authority you applied through (CAF form).
  
  
• Explain the situation clearly: You are an SEBC candidate in Odisha but the CAF form was mistakenly filled as OBC.
  
  
• Mention that Odisha doesn't issue OBC certificates.
  
  
• Request a correction in the category on your application form if possible.

If the exam authorities allow corrections, they might ask for supporting documents. You can provide:

• A copy of your SEBC certificate issued by the Odisha government.
  
  
• A document from a competent authority in Odisha stating that the state doesn't issue OBC certificates.

• If corrections are not possible, consider reaching out to the institute's admissions office directly. Explain the situation and see if they can accommodate your case based on your SEBC certificate.
  
  
• There might be a specific category for SEBC candidates in the institute. Discuss this possibility with the admissions office.

https://www.careers360.com/sebc-full-form

I hope it helps!