If a third party unfairly interferes with a business contract or relationship and causes damage, a tortious interference claim may be a viable option. Tortious interference occurs when someone intentionally interferes with a contract or business relationship between two other people or companies.Tortious interference with a contract occurs when a third party intentionally damages the contractual between two parties. Wrongful or tortious interference with contracts happens when a thirdparty intentionally causes a contracting party to commit a breach of contract. The jury found in favor of plaintiff on the tortious interference with a contractual relationship claim, and determined that plaintiff's. What this means is that they must have known about the contractual relationship and caused the breach anyway. Plaintiff asserts tortious interference in contractual relations and business relationship against both. Kewadin and Greektown. Tort Law: No Claim for Tortious Interference Where Defendant Has Contractual Relationship With Plaintiff.