问题在于，遗留系统并不进行数据输入编辑和检验，因此不能确保应用程序中捕捉的数据与逻辑数据模型保持一致。
The problem was that the legacy systems did not have the data entry edits and validations to ensure that the data captured in the application was consistent with the logical data models.
必要的遗留数据库可能不可用，或者可能无法在足够细的层次上捕获，除非花费金钱并付出努力来改变遗留输入环境。
Required legacy data may not be available or perhaps cannot be captured at a sufficient level of detail, unless money and effort are spent changing the legacy input environment.
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