GL Code in Method 'IF_EX_ME_PROCESS_REQ_CUST~CHECK'

Hi Experts ,

                 I have to check the line item wise 'GL CODE' data in the check method of the badi 'ME_PROCESS_REQ_CUST'  (IF_EX_ME_PROCESS_REQ_CUST~CHECK ). Can anybody tell me how is it possible .

Thanks and regards,

Deb