Compatibility of ECC 5.0 to BI 7.0 and replication issues

Hi BW Gurus,

Implementing BW project in the BI 7.0 and the source system is ECC 5.0. We need to extract data from ECC 5.0 to BI 7.0.

Is it supports good compatabiility with ECC 5.0 to BI 7.0?

During extraction can we replicate the R3 datasources as the 7.0 data sources or we dont have the option of 7.0?

or still we have to use the 3.x functionality for R3 datasources

Regards,

Shahid