The duty of the post-contract is obviously quite different from the contract given duty, the contract assumpsit duty and the pre-contract duty.
后合同义务与合同给付义务、约定义务、先合同义务有着显著的不同。
2
The legal compulsory regulation means when it is applied it should not be changed by the purpose of party, and it can not be obviated or changed by assumpsit.