Overhead Costs 
Overhead costs are costs which can be assigned only indirectly to the production order, such as electricity costs or general storage costs.
Overhead costs are assigned to the production order via overhead surcharges. They are updated in the order under the cost elements defined in the costing sheet.
A costing variant is defined in customizing per order type and plant. The costing variant refers to a costing sheet. The costing sheet determines what overhead surcharges are assigned to the order.
The costing sheet specifies:
Which direct costs to apply surcharges to
Under which conditions an overhead is calculated
How high, depending on these conditions, the surcharge percentage is
Which object (for example, a cost center) is credited under which cost element during actual postings