So, we must analyze the causes of prestation unjustified enrichment and non-prestation unjustified enrichment and reconstruct its constitutive requirements.

• 因此，应该从不当得利制度的物权变动理论基础视角分别对给付型和非给付型不当得利的物权变动原因进行分析，重新构建其构成要件。