Dear Michael,
I beleive that REFX - Standard service charge settlement process will helps you where you are claring the costs through a RE Contract - In RE contract we have the provision to assign the Cost centre to track the expenses.
The below links may helps you to have a understanding on SERVICE CHARGE SETTLEMENT process.
http://help.sap.com/saphelp_470/helpdata/en/b3/1a393cc2b06a58e10000000a114084/content.htm
Config Manual with clarifications :
Regards,
Subbarao