Activity types describe activities provided by cost centers that are measured in units of time or quantity. An activity type for labor hours needs to be created with an allocation cost element of type 43. To do so, navigate to transaction code KL01 and enter the activity type "LABOUR", valid date range of 01/01/2006 to 12/31/9999, description as "Labour hours", activity unit as "H", allocation cost element 943202, average price indicator, and activity type category 1. This will create the necessary activity type to allocate labor hour costs from the labor cost center to production orders.