The majority of the senior managers in the joint venture providing maritime and inland water transport services must be Brunei nationals as per indication in Brunei Darussalam's CPTPP list of on Non-Conforming Measures (Annex 1) including restrictions that are supposedly reflective of underlying regulations.
"ANNEX I - SCHEDULE OF BRUNEI DARUSSALAM
Sector: Transport Services
Sub-sector: Maritime passenger transport services, Maritime freight transport services, Services auxiliary to maritime transport
Obligations Concerned: National Treatment (Article 9.4), Performance Requirements (Article 9.10), Senior Management and Boards of Directors (Article 9.11), 
Market Access (Article 10.5), Local Presence (Article 10.6)
Measures: Administrative Measures and Guidelines
Description: Investment
1. Foreign nationals and enterprises may not provide maritime passenger and freight transport services as Brunei Darussalam-flagged vessels in Brunei Darussalam, unless:
(a) they register such vessels under the Brunei Darussalam flag through an enterprise established in Brunei Darussalam that is a joint venture, where the foreign national or enterprise does not own more than 40 per cent equity shareholding in the joint venture; (b) they comply with any performance requirements imposed, including a requirement to transfer a particular technology or other proprietary knowledge as long as such requirement to transfer technology or other proprietary knowledge does not unreasonably prejudice the legitimate interests of the owner of technology or proprietary knowledge and is not for the purposes of commercial exploitation by Brunei Darussalam; and (c) a majority of the senior managers in the joint venture are Brunei nationals.
2. Foreign nationals and enterprises may not provide services auxiliary to maritime transport services at Muara Port, unless:
(a) through an enterprise established in Brunei Darussalam that is a joint venture, where the foreign national or enterprise does not own more than 51 per cent equity shareholding in any such enterprise providing services auxiliary to maritime transport services; and (b) a majority of the senior managers in any such enterprise established are Brunei nationals.
3. The number of enterprises in Brunei Darussalam providing maritime passenger and freight transport services and services auxiliary to maritime transport at Muara Port may be subject to needs-based quantitative limits.” (ANNEX I - SCHEDULE OF BRUNEI DARUSSALAM, Comprehensive and Progressive Agreement for Trans-Pacific Partnership (CPTPP)) 
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"[...] Part I - Conditions for registration of ships [...]
Interpretation.
2. In this Part -
"age", in relation to a ship, means the difference between - (a} the year in which its keel was laid, or was at a similar stage of construction; and (b} the year in which it is to be registered as a Brunei Darussalam ship;
"citizen of Brunei Darussalam" includes a permanent resident of Brunei Darussalam;
"foreign-owned ship" means a ship that is not locally owned;
"local company" means a company, or a company which has a holding company, in which all or a majority of the shares are owned by persons who are citizens of Brunei Darussalam. 
[...]
Non-application.
4. These Regulations shall not apply to {a) any fishing vessel; {b) any pleasure craft; and {c) ships or classes of ships belonging to the Government carrying out safety, customs, fiscal, health or immigration enforcement functions. 
[...]
Owners of ships registered under Part II of Order.
5. The following persons are qualified to be owners of ships which are to be registered under Part II of the Order - {a) citizens of Brunei Darussalam; (b) bodies corporate incorporated in Brunei Darussalam; and (c) an international business company or a foreign international company incorporated, converted or registered under the International Business Companies Order, 2002 (S 56/2000).
Closure of registry of certain tugs, barges and ships.
6. The registry of a tug or a barge, or a ship of less than 1,600 tons, and owned wholly or partly by- (a) a local company shall be closed if all or a majority of the shares in the company or its holding company, if any, are; or (b) a citizen of Brunei Darussalam shall be closed if any share in the tug, barge or ship is, transferred to a person who is not a citizen of Brunei Darussalam or another local company.
[...]
Registry of foreign-owned and locally-owned ships. 
10. (1) No foreign-owned ship shall be registered unless it is (a) fitted with mechanical means of self-propulsion; and (b) of not less than 1,600 tons. 
(2) No ship above 17 years of age shall be registered unless the Registrar is satisfied that the ship is in a satisfactory condition in all respects. (3) Sub-regulation (2) shall not apply to a Brunei Darussalam ship which is registered anew under subsection (1) of section 19 or subsection (1) of section 34 of the Order. [...]"(Merchant Shipping (Registration of Ships) Regulations, 2006, Amended 2009).
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"1.  Prerequisites For Registration
1.1 Only the following persons may be registered as owners of Brunei vessels:  
(1)   Citizens /  permanent residents (of Brunei; and  
(2)  Companies incorporated in Brunei Darussalam.  
1.2 A Vessel may be registered under the ownership of a foreign owned company or a local owner company.  
(1) A foreign owned company is a company incorporated in Brunei in which more than 50% of its equity is owned by non-citizens of Brunei Darussalam.  
(2) A local owned company is a company incorporated in Brunei in which more than 50% of its equity is owned by citizens of Brunei, or by another local Owned company. 
1.3 A Vessel owned by a foreign owned company may be registered under the following Conditions:  
(1) The company must have a minimum paid-up capital of B$50,000. Notwithstanding the minimum paid-up capital requirement, the company’s Related company(s) may be waived from this requirement provided the Company and / or its related company(s) have registered, applied to register or have informed the Registrar that they will apply to register ship.
(2) The vessel must be at least 1,600 GT and be self-propelled. 
The restriction of a minimum of 1,600 GT on the size of ship being registered in the Registry of ship, this restriction applies to any ship-type if the ship is not owned by a local company. 
The term “local Company” means a company in which all or a majority of the shares are owned by persons who are –  Citizen of Brunei; or Companies in which, or which have companies in which, all or a majority of the shares are owned by persons who are citizens  of Brunei or local Companies. [...]" (BRUNEI DARUSSALAM REGISTRY OF SHIPs, Guidelines Application for Regristration As A Brunei Darussalam Ship)
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[text not reproduced here; see link] (MPABD, GUIDELINES ON THE  APPLICATION OF  LICENSE TO OPERATE FOR FOREIGN VESSEL)
ANNEX I - SCHEDULE OF BRUNEI DARUSSALAM, Comprehensive and Progressive Agreement for Trans-Pacific Partnership (CPTPP)
Merchant Shipping (Registration of Ships) Regulations, 2006, as amended
BRUNEI DARUSSALAM REGISTRY OF SHIPs, Guidelines Application for Regristration As A Brunei Darussalam Ship
MPABD, GUIDELINES ON THE  APPLICATION OF  LICENSE TO OPERATE FOR FOREIGN VESSEL
[<a href="https://www.mfat.govt.nz/assets/Trade-agreements/TPP/Annexes-ENGLISH/Annex-I.-Brunei.pdf">CPTPP</a>],[<a href="https://www.agc.gov.bn/AGC%20Images/LAWS/Gazette_PDF/2006/EN/s062.pdf">Reg</a>],[<a href="https://mpabd.gov.bn/wp-content/uploads/2019/08/GUIDE-LINE-REGISTERING-BRUNEI-SHIP.pdf">Guide</a>],[<a href="https://mpabd.gov.bn/wp-content/uploads/2024/01/2024_01_23-GUIDELINES-ON-THE-LICENSE-TO-OPERATE.pdf">Guide</a>]