Bapi followed by BDC

Hi all,

I have a requirement wherein i am calling a BAPI follwed by a BDC to achieve a upload of databse.Now my problem is that the BAPI call will be successful only if i call BAPI_TRANSACTION_COMMIT.

But it may so happen that my bdc fails.In that case i dont want my BAPI to make the changes.How can i have a check on these as whenever my BDC fails the BAPI should be rollbacked.

Itz an urgent issue.Plz reply soon..

Useful answers will be rewarded..

Thanks & Regards,

Arun