Checker and Maker roles in the Financial

What's the Checker or Maker?

 

Maker-checker (or Maker and Checker, or 4-Eyes) is one of the central principles of authorization in the Information Systems of financial organizations.The principle of maker and checker means that for each transaction, there must be at least two individuals necessary for its completion. While one individual may create a transaction, the other individual should be involved in confirmation or authorization of the same. Here the segregation of duties plays an important role. In this way, strict control is kept over system software and data keeping in mind functional division of labor between all classes of employees.

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就是一个是操作员，一个是监督的; 每个事务流程需要这两个角色一起来完成.

但是在系统中这两个角色属于不同的group。

如何判断当前User 是maker 或者 checker？