Whilst the processing of an earning code gets picked up for generating earnings, it would be stronger if the payroll earning codes held against a worker were in a date effective framework so that end users could make future, and past dated changes (e.g. for retropay scenarios). Earning Code changes would still be made via the employee record, with the addition of date effective to/from dates (including our edn of time date 2154). These codes should then be picked up where active and for the appropriate earnings generation timeframe.