Legal analysis: A legally binding statement must first be signed by both parties to prove that both parties have the same meaning and agree to perform their duties. Both parties have clearly indicated the subject matter, and the format is standardized, with witnesses present. When writing a statement, it's best to write clearly the liability for breach of contract. A valid commitment must meet the following conditions: 1. This commitment reflects the true wishes of both parties. 2. Do not violate relevant laws and regulations. 3. Do not infringe upon the legitimate interests of others. 4. The content of the letter of commitment does not violate the principle of public order and good customs.

Legal basis: Article 465 of the Civil Code of People's Republic of China (PRC). Contracts established according to law are protected by law. A legally established contract is legally binding only on the parties, except as otherwise provided by law.