Hi Jian,
For extracting transaction data from ECC, there is standard info-provider (0FIGL_10). This info-provider will fetch data from ECC table (FAGLFLEXT).
For Ownership data, there is no such info-provider, as these information are maintained at BPC Level not at Transaction level.
For Exchange Rate, You can fetch rates from ECC (if maintained there) else you have to maintain this at BPC Level.
Regards,
Rahul