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This article explains how to keep the history of Payscale Rates.
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Step-by-step guide
Select Payscale Table where the rates need to be updated. Click the "Duplicate" button.
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In the window that opens change the Table code to indicate that this is old rates or a year that the rates were valid for. Check the option "Passive" and press "Ok" to save. This saved passive duplicate will keep the history of rates.
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Open the initial Payscale Table and update the pay rates as necessary. In this way, the crew will not
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lose the link to their Payscales but the pay rates will get updated.