As a new system of contract obligation, the after-contract obligation is briefly specified in contract law of our country.

后契约责任制度作为一种新的合同责任制度，我国合同法对此作了简要规定。

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After the contract becomes effective, a party shall not refuse to perform its obligation owning to any change in its name or change of its legal representative, person in charge, or undertake.

第七十六条合同生效后，当事人不得因姓名、名称的变更或者法定代表人、负责人、承办人的变动而不履行合同。

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After a future commercial apartment contract goes into effect, for various reasons there could be changes to the rights and obligation of the parties involved.

商品房预售合同在订立生效后，由于各种原因，可能发生当事人预售合同权利和义务的转移，即一方甚至是双方当事人的变更。

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