SAP ISU datamodeling and BW

Hello Guru's,

I am new to SAP ISU , can any help me with BW integrations of SAP ISU.

Like IS-U data model and standard industry processes, how BW is different in SAP ISU landscape. what are the function modules used for metering and billing module. Any document in this regards will be appreciated.

Points would be assigned.

Regards

Pavan