BAPI's for MR21, ME31L, ME32L, ME11, ME12

hi frnds,

i need a help on Bapi's. i need to upload the data for MR21, ME31L, ME32L, ME11, ME12. suggest me how to find bapis and if any had done this send me the code.

Points will be rewarded for helpful answers.

Thanks & Regards,

Balu