Request of information: Italian softwarehouse for federated Data Warehouse

Hello,
I work for an Italian financial Company that needs to reorganize the current reporting system (mainly based on Business Objects), which is made of many Data Warehouses and Datamarts in Oracle and SAP/BI.
I'm interested in a federated solution since I have to integrate different business by saving as much as possible the existing platform.
Could you please indicate me some consultant company which has already developed a federated solution in Italy or, at least, which as got this king of know-how and has a seat in Italy?
Thanks in advance.