[ABAP] Access leave request attributes

cl_pt_req_badi=>get_request( EXPORTING im_req_id  = request_id
                             IMPORTING ex_request = DATA(request) ).

request->get_all_attribs( IMPORTING ex_attribs_struc = DATA(req_attribs) ).

DATA(req_begda) = req_attribs-version-item_tab[ 10 ]-value.

Take a look in the item_tab to see the specific request values.