Mendix Academy - 2.3.1 Creating Entities and Attributes
academy.mendix.com/link/modules/182/lectures/1398/2.3.1-Creating-Entities-and-Attributes
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One way to do this, is to add a Before Commit Event Handler to the TeamMember entity. This event handler will trigger a microflow that checks whether only 1 user role has been selected. If true, it allows the team member to be committed. Else, if false, it stops the commit and gives a validation feedback message.
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