ACT_HIGHEST_RATE_INFO is a field which applies the higher of the wage rates derived from either the 'Rate Source' chosen, or from the Employee Prime Assignment Rate. The 'Highest Rate of the Day' logic is invoked independently and at a later point in time. It compares the 'Wage Rate' stamped on the Pay Line Detail, to the highest 'Wage Rate' on all Pay Line Details. After choosing the higher, the calculation rule is applied and the individual amounts generated.