Task
Task Line
Source: Person
Start Date: 20/10/2006
Stop Date: 23/10/2006
Resource: Service
quantity_unit: service's quantity unit
Quantity: Q
Q' in default service's quantity unit
Task Line consumes a quantity of a service unit.
It's the answer of: what did the person do during his working time ?
The quantity_unit is a valid unit from the Service.