I inherited this code.
It is using 2 Mapping Loads and then taking the fields from this to calculate the Total Pay field.
map_PayRate: Mapping Load TimeCodeID, [Pay Rate] Resident TimeType;
map_HourlyWage: Mapping Load Employee_ID, [Hourly Wage] Resident [FinalEmployee]
ApplyMap('map_hourlyWage',EmpID) * TimeWorked * ApplyMap('map_PayRate',"TimeCode") as [Total Pay]
This all looks normal to me.