The reason for this different approach is that, unlike the United Nations Sales Convention, the draft Convention deals mainly with the proprietary effects of an assignment and may, therefore, have an impact on the legal position of third parties.
采取这种不同做法的原因是，与《联合国销售公约》不同，公约草案主要处理转让的专属权效果，因此可能影响第三方的法律地位。