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Function modules are program modules which have a defined interface and allow type testing of parameters.
They are managed with transaction SE37 and combined to function groups according to relevant criteria. You can access this transaction under Tools
® ABAP Workbench ® Function Builder.The HR function groups use the naming convention RPxx or HRxx where xx is an identifier of your choice.
You can use the SHOW FUNCTION
* editor command to branch from report processing to function module display.