Fetching the information from tcode to custom program in PM

Dear all,

I am trying to use the method of the following BADI: CEWB_TSK_UPDATE->CHECK_TSK_AT_SAVE. This method is usually triggered when we try to save data related to task list, e.g., when we save in tcode IA01, this method will do a check. Why I need this method, is to fetch the data that are saved in business transaction IA01 and send them in my custom program. So, the code would we as follows:

CALL TRANSACTION 'IA01'. 
PERFORM get_data.

Now inside this perform I want to fetch the data that we saved in this transaction. How can I use this method to achieve this functionality? So, how can I use this method to fetch the importing parameters of this method?

Thanks and any help is greatly appreciated!!

R