Need help on group by for more than one field on target idoc

Hi I need to group by E1EDl24,EiEDl11,E1EDl37Attached screen shot with the sample source data Expecting data in the folollowin format.Thanks for your help E1EDL24  E1EDL43    E1EDL11    E1EDL11    E1EDL11 which is group by Posnr no from E1EDl24 and in that again grp by po no and ponr no from E1EDl43 then followed by all sl no from E1EDL11 I am getting like this E1EDL24 E1EDL43 E1EDL43 E1EDL43 E1EDL24 E1EDL24 E1EDL24 E1EDL11 E1EDL11 E1EDL11 I am expecting only E1EDl24 ,one E1EDL23 for each PO no,ponr no and porno from E1EDl43 Thanks for your help