Foreign investment in the manufacturing and retail distribution and exporting of agriculture crops, sweets, cocoa and chocolate, leather products, gasoline, beverages and some perfumery and cosmestics products is subject to joint-venture with Myanmar citizen/enterprises. 
"List of Restricted Investment Activities
1. In exercise of the powers conferred under section 42 and section 100(b) of Myanmar Investment Law, with the approval of the Union Government, Myanmar Investment Commission issued the list of  restricted investment activities  as follows: [...]
(C) Investment activities allowed only in the form of a joint venture with any citizen owned entity or any Myanmar citizen: 
Retail sale of electrical household appliances, furniture, lighting equipment and other household articles in specialized stores (Manufacturing and domestic distribution of leather products)
Retail sale of food, beverages and tobacco in specialized stores (Cultivation of crops in agriculture land, distribution them to the local market and exporting them; Value added manufacturing and domestic distribution of cereal products such as biscuits, wafers, all kinds of noodles and vermicelli; Manufacturing and domestic distribution of all kind of confectionery including those of sweet, cocoa and chocolate; Manufacturing and domestic distribution of malt and malt liquors and non-aerated products; Manufacturing, distilling, blending, rectifying, bottling and domestic distribution of all kinds of spirits, alcohol, alcoholic beverages and nonalcoholic beverages; Manufacturing and distribution of purified drinking water); 
Retail sale of perfumery and cosmetic articles (Manufacturing and domestic distribution of all kinds of soap) [...]" (Myanmar Investment Commission, Notification No. 15/2017, 'List of Restricted Investment Activities')
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"42. The following types of investment businesses shall be stipulated as restricted investment: [...]
(c) investment businesses allowed only in the form of joint venture with any citizen owned entity or any Myanmar citizen [...]"(Myanmar Investment Law, The Pyidaungsu Hluttaw Law No. 40/2016 of 18 October 2016, Art. 42)
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"Chapter II Types of Investment: Restricted Investment Activities […] 
22. For the purpose of section 42(c) of the Law, subject to any express exception in the relevant notification, the minimum direct shareholding or interest of a Myanmar Citizen Investor in the joint venture is 20%. [...]" (Myanmar Investment Rules, Notification No. 35/2017 of 30 March 2017, Art. 22)
Myanmar Investment Commission, Notification No. 15/2017, 'List of Restricted Investment Activities'
Myanmar Investment Law, The Pyidaungsu Hluttaw Law No. 40/2016 of 18 October 2016, Art. 42.
Myanmar Investment Rules, Notification No. 35/2017 of 30 March 2017, Art. 22.
[<a href="http://www.dica.gov.mm/sites/dica.gov.mm/files/document-files/20170419_eng_42_update.pdf">Notification</a>],[<a href="http://www.dica.gov.mm/sites/dica.gov.mm/files/document-files/myanmar_investment_law_official_translation_3-1-2017.pdf">Law</a>],[<a href="http://www.dica.gov.mm/sites/dica.gov.mm/files/document-files/mir_english_0.pdf">Rules</a>]