An Oklahoma Petition in Error is a legal document used to challenge a decision that was made by a lower court. It is filed with the Supreme Court of Oklahoma and is typically used when a party believes a decision was made in error. There are three types of Oklahoma Petitions in Error: Direct Appeal, Collateral Attack, and Writ of Certiorari. A Direct Appeal is used when the lower court's final decision is being challenged, while a Collateral Attack is used when an underlying issue is being challenged. A Writ of Certiorari is used when a party believes that the lower court's decision was based on an incorrect interpretation of the law. All three types of Oklahoma Petitions in Error must be filed within 20 days of the lower court's decision.