MIGO BADI MB_MIGO_BADI not being called

We upgraded ECC 6.0 from EnhP3 to EnhP6. We've implemented the BADI MB_MIGO_BADI prior to upgrade and it was working fine. After upgrade BADI is not being called. After debugging MIGO transaction in old and upgraded box, I found that in old ECC, transaction calls the method PBO_DETAIL in classid 'MIGO_BADI_IMPLEMENTATION1' while in upgraded box it calls with classid 'MIGO_BADI_IMPLEMENTATION_CIN'.

Any idea where classid is defined in BADI and how to resolve this issue?

Thanks,

Milind