Each wage type contains three value fields: RTE, NUM and AMT.
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The RTE specifies hourly rate.
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NUM specifies the number of units, e.g. 3 hours of overtime.
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AMT specifies the amount. It is obtained by multiplying RTE with NUM. For basic pay wage types such as salary, the amount is stored in AMT field.
If you are from PeopleSoft background, I would like to say that a wage type can represent an earnings code or deduction code or a tax code.