At sellers that are click-and-mortar companies, such as levi’s or gm, has (have) forced them to limit their b2c efforts, or not to sell direct online.

Channel Conflict

Explanation:

According to my research on click-and-mortar company problems, I can say that based on the information provided within the question the term being mentioned is called a Channel Conflict. This is formally defined as a situation in which "manufacturers get rid of their intermediaries by selling their products directly to consumers through other marketing methods and/or over the Internet.

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the business rule that governs the relationship is one-to-many as there are multiple customers for each agent.