SCM系统能够通过接口或中间件与遗留系统交互。
SCM systems can interact with legacy systems through interface software or middleware.
必需在已有架构下进行工作（例如，必需与遗留系统进行结合）。
Must work within existing architecture (i.e., must interact with legacy systems).
payroll data service component：通过接口与遗留系统连接，并向payroll服务提供有关基本工资、HRA、浮动工资、奖金和所得税的信息。
Payroll data service component: interacts with the legacy system and provides basic, HRA, variable pay, perks, and Income tax information to the payroll service.
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