For this reason, they must use a transaction attribute of MANDATORY, indicating that a transaction is needed by the method but it should have been started elsewhere (such as in the client layer).

基于此原因，它们必须使用MANDATORY事务属性，这表示方法需要事务，但不应该在别处开始它(比如说在客户端层中)。

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In this case, the API layer methods must have a transactional attribute of MANDATORY without any rollback logic.

在这种情况下，api层方法必须拥有一个事务属性MANDATORY，而不应包括任何回滚逻辑。

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