Rules on Civil Procedure
Section 4. Filing and contents of petition. - The action shall be commenced by filing a verified petition alleging therein with particularity the facts and the law relied upon for annulment, as well as those supporting the petitioner's good and substantial cause of action or defense, as the case may be.
The petition shall be filed in seven (7) clearly legible copies, together with sufficient copies corresponding to the number of respondents. A certified true copy of the judgment or final order or resolution shall be attached to the original copy of the petition intended for the court and indicated as such by the petitioner.
The petitioner shall also submit together with the petition affidavits of witnesses or documents supporting the cause of action or defense and a sworn certification that he has not theretofore commenced any other action involving the same issues in the Supreme Court, the Court of Appeals or different divisions thereof, or any other tribunal or agency if there is such other action or proceeding, he must state the status of the same, and if he should thereafter learn that a similar action or proceeding has been filed or is pending before the Supreme Court, the Court of Appeals, or different divisions thereof, or any other tribunal or agency, he undertakes to promptly inform the aforesaid courts and other tribunal or agency thereof within five (5) days therefrom. (n)