BDC Changes Rollback

Dear ALL,

Kindly help me on the basis of following information.

I have to run a BDC1 on SU10 TCode to delimit roles assigned to a user. after that i have to run BDC2 to assign roles to that user. my req is that if one BDC1 passes and BDC2 fails then i have to rollback the changes made by BDC1.

how should i go about it.

if anyone has some code then kindly mail me at amitgkv@rediffmail.com

Thanks in advance.