Interference with an existing contractual relation occurs when a third party interferes with an existing contract between 2 parties. Tortious interference with a contract occurs when a third party intentionally damages the contractual between two parties.Wrongful interference with a contractual relationship occurs when:1) A valid and enforceable contract exists between two parties. 140, 670 S.E.2d 704. Civil Rights Act, and tortious interference with prospective contractual relations, among others. Appropriate to the claim and the evidence in the case. Source and Authority. 1. Appropriate to the claim and the evidence in the case. Certain key elements must be demonstrated for tortious interference with a contractual business relationship. Breach of fiduciary duty) amounted to "improper" interference with contractual relations).