Code of Organization and Civil Procedure (Cap. 12), article 487

487. The judge who shall have granted or refused the leave or authorization applied for, or who shall have otherwise taken cognizance of any matter of volunt ary jurisdiction, may not on such ground be challenged or precluded from taking cognizance of any cause in any of the courts of contentious jurisdiction in which any issue relating to such matter may afterwards arise. Grounds for impugning acts executed by leave or with authorization of court.