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After saving you will need to enter component values.
Click on the newly assigned pay component (which will now appear in bold in your component list as it is assigned at the current scope level) to bring up the component values at the right of your screen. Enter Amount to Deduct/Amount to pay and/or any other required fields (e.g. Bank account number).
This component will now be automatically generated and added into this employee's pay packet upon creation each pay run.