How to create purchase reqisation using BAPI....?

Hi Guru's,

i have 100 purchase reqisation details in CSV file ..

could you please any one of you ..which BAPI i have to use to create the purchase reqisation's..

please porvide any program logic realated to this that would be helpfull to me..if you have...:)

please let me know if my question is not clear..

please let me know if any alternative process for this....

thanks in advance and will give full points..

Srinivas...