U can use abap memory but its not the right way of doing it .. call the following code in the user exit and it will return the message in the BAPI. perform message_vbfs_aufbauen(sapfv45l) using 'V1' ...
may be there is no data for the where clause u giving.. try removing all the conditions in the where clause...and juss add one condition and see if data is fetched.... keep adding one condition at a time and see which condition is causing data not t...
