There was a thread about it a while back; the WBO does not enforce mandatories unless the TV networks aprove that mandatory. If the TV network would rather hand-pick an opponent for that mandatory defence, according to WBO rules, that is fine.
DEFENSE OF THE TITLE All WBO World Champions except in the Heavyweight Division shall defend his title at intervals not greater than nine (9) months counting from the date of the acquisition thereof or from the last compulsory defense, as the case may be, in a twelve (12) round fight, against the Mandatory Challenger, as determined by the Championship Committee according to these Regulations, unless an exception is made pursuant to these Regulations. For reasons unique to the Heavyweight Division, the WBO World Champion in the Heavyweight Division shall defend his title at intervals not greater than twelve (12) months counting from the date of the acquisition thereof or from the last compulsory defense as the case may be in a twelve (12) round fight, against the Mandatory Challenger, as determined by the Championship Committee according to these Regulations, unless an exception is made pursuant to these Regulations. The Championship Committee shall designate no more than two mandatory defenses in a category during the above-specified time. When the Committee orders a Champion to make more than one mandatory fight, it shall notify the Champion of that order at least 60 days prior to the first mandatory fight; and the second mandatory fight shall not take place before the next 90 days. In the interim period, the World Champion may defend the title against any contender classified within the fifteen (15) best by the World Boxing Organization, always with the approval of the World Championships Committee. The WBO World Championship Committee may, in its discretion, vacate a Champion’s title regardless of cause or fault if the Champion fails to defend his title within a nine (9) month period (12 months in the case of the Heavyweight Division). This decision will be final unless appealed to the Complaint and Grievance Committee within ten (10) days of Notification to the Champion as provided for in these Rules. A Champion so stripped of his Title shall be classified as the Mandatory Challenger for the winner of the Vacant Championship, provided that he has complied with the WBO and ABC rating criteria. 6) DESIGNATION OF THE MANDATORY CHALLENGER The Mandatory Challenger may be selected and determined by the World Championship Committee according to the current list of the best-classified boxers, promulgated by the WBO Classification Committee. For the purposes of designation of the Mandatory Challenger, the current list of the Classifications is that which corresponds to the month for which the determination is to be made that the World Champion is obliged to defend his Title against the Mandatory Challenger, or any other date in which the World Championship Committee may determine, for just cause. When a Champion must make a mandatory defense, the Mandatory Challenger shall be the highest classified available boxer who, in the judgment of the World Championship Committee, best satisfies the following criteria: 1) Has a record acceptable to the World Championship Committee, and who, because of accomplishment and achievement, is recognized by the World Championship Committee as a class boxer; and 2) Complies with the WBO and Association of Boxing Commissions Criteria for the Ratings of Professional Boxers; and 3) In the event that the Champion has a contract with a major television network (HBO, SHOWTIME, ZDF, Sky or other similar broadcast company), is an acceptable challenger to the Champion’s television network. A classified boxer must request recognition as Mandatory Challenger in writing to the WBO on forms provided by the WBO. This request must include an undertaking to be subject to and to abide by the Regulations and to be bound to participate in and comply with the results of a purse bid if negotiation with the World Champion does not result in a contract for the Championship fight. The World Championship Committee may deny a request for recognition based on any of the above referred criteria or because the Champion has an approved unification bout or an approved unification tournament scheduled, or for other good cause. If a fighter is classified higher than the Mandatory Challenger, and is not designated the Mandatory Challenger because of criteria three (3), or for other good cause, the Championship Committee has the authority to order an eliminatory bout between the higher classified boxer or boxers provided that at least one of the elimination bout contestants is considered an acceptable challenger to the Champion’s broadcast company. The winner of the elimination bout shall be then designated the Mandatory Challenger the next time a mandatory fight in that category is ordered if the winner of the elimination bout retains his rating subsequent to the elimination bout. The designation of a Mandatory Challenger creates an obligation on behalf of the Champion to defend against the designated Mandatory Challenger as a condition to the Champion’s retention of the title, which obligation may be subject to modification or extension by the Championship Committee for good cause, such as (but not limited to) participation by the Champion in a unification bout or a unification tournament on such terms and conditions as the Championship Committee approves. The designation of Mandatory Challenger does not create rights in the Challenger, and may be subject to such conditions, modification, or extension as the Championship Committee determines. That a Champion has signed a contract for the defense of his championship, even against a Mandatory Challenger approved and designated by the Committee, shall not of itself constitute compliance with these Regulations, unless the Championship defense actually takes place within the stipulated time period.
7) UNIFICATION BOUTS AND UNIFICATION TOURNAMENTS AS MANDATORY TITLE BOUTS The World Championship Committee has the power and authority to sanction a Unification Bout or participation in a unification tournament as a Mandatory Title Bout. A Unification Bout is a championship bout with the champion of another world sanctioning organization recognized by the WBO, including the WBA, the WBC and the IBF. A Unification Tournament is a tournament of single elimination bouts involving 4 Champions or top contenders of 2 or more WBO recognized world-sanctioning organizations. When a Champion has been granted an extension of his Mandatory Obligation to participate in a Unification Bout or a Unification Tournament, his next mandatory obligation must be completed within 9 months of completion to the Unification Bout or Unification Tournament. 8 ) CRITERIA TO MAINTAIN RATING AS A CLASSIFIED FIGHTER To keep his position on the official list of classifications and to be eligible to be designated by the World Championship Committee as the Mandatory Challenger, contenders number 1 and number 2 shall defend his classification at least annually against any of the classified contenders in his weight category, according to the current list of classifications promulgated by the Classifications Committee, and he shall comply with the Association of Boxing Commissions Criteria for Ratings of Professional Boxers. If contender number 1 and/or contender number 2 fails to comply with this Rule, contender number 1 and/or contender number 2 may lose his classification as such. It is the responsibility of the classified boxer to know the WBO and ABC Criteria for Ratings, to meet the criteria for ratings, and to keep the WBO Classification Committee informed of all facts relevant to his rating. If any of the classified boxers (with the exception of contender number 1 and/or contender number 2) rejects the World Champion in an optional title fight or refuses to fight contender number 1 and/or contender number 2 in a ten round fight, without just cause, he may be eliminated from or lowered in the list of classifications. 9) VOLUNTARY DEFENSES In the interim period of the compulsory defense of his title against the Mandatory Challenger, the World Champion may defend his title against any opponent selected from the list of the fifteen best boxers in his weight category or division, according to the current list of classifications of the Organization. 10) COMPULSORY DEFENSES Within the sixty (60) days prior to the date of the compulsory defense, no World Champion shall sign a Contract for the defense of his title, nor defend it against a boxer other than the Mandatory Challenger, unless authorized by the World Championship Committee. In the case a World Champion should lose his title against a contender other than the Mandatory Challenger, the new World Champion shall defend his title in a bout, within a period not greater than one hundred and eighty (180) days counting from the dated of the acquisition of the title, against the Mandatory Challenger in his category according to the current list of the Classifications Committee, and from then on, shall defend his title at intervals not greater than nine (9) months against the Mandatory Challenger, unless an exception is approved by the World Championship Committee. The World Championships Committee shall inform each World Champion recognized as such by the Organization in his respective weight category of division, in writing, with at least sixty (60) days of previous notice, of the obligation to defend the title in a compulsory fight against the Mandatory Challenger. It is contemplated that the Champion and the Mandatory Challenger shall attempt in good faith to reach an agreement within the first thirty (30) days of the sixty (60) days mentioned herein. The President or the Championship Committee may increase or decrease the time in which the Champion and the Mandatory Challenger should reach an agreement. If the Champion and the Mandatory Challenger fail to reach agreement within such time as is determined by the President consistent with these regulations, the President may order a Purse Bid as hereinafter provided. If either the Champion or the Mandatory Challenger requests that the Purse Bid take place before the Thirty (30) day negotiation period is completed, the WBO President may call the Purse Bid before the negotiation period ends.