Activity Quantity Determination 
Use
Activity quantity determination uses
Formulas to calculate the amounts used in the evaluation of a template. For example, you can allow the R/3 System to calculate the quantity of a sender object (for example, a business process) utilized by a cost object.In order to define the formulas, you use a formula editor function.
See also:
Example: Quantity Determination (Template for cost object/calculation)
Example: Quantity Determination (Template for formula planning/cost centers)
Defining Formulas
Workflow-Integration Business Process