Cost Centers are financial objects from SAP where cost are required to be allocated to. Cost Centers can be interpreted as Responsible or Occupying. When they are Responsible, the Cost-Center is linked to the Rent From unit. This enables the link of all costs that are registered to this Rent From unit to this Cost Center. When they are Occupying, they need to be charged for Internal use, like when the Rent To unit is used for Internal reasons, and the Occupying Cost Center needs to get charged for this use.