Getting runtime error while using hash table

Question

Hi,
I have defined an internal table as hash with unique key.But while executng the prog. its giving a dump saying "There is already a line with the same key." My code is
  data: begin of wa_rkrp,
         vbeln like vbrk-vbeln,
         fkdat like vbrk-fkdat,
         fkart like vbrk-fkart,
         kunag like vbrk-kunag,
         knumv like vbrk-knumv,
         inco1 like vbrk-inco1,
         spart like vbrk-spart,
         netwr like vbrk-netwr,
         mwsbk like vbrk-mwsbk,
         uepos like vbrp-uepos,
         werks like vbrp-werks,
         lgort like vbrp-lgort,
        end of wa_rkrp.
  data lt_rkrp like hashed table of wa_rkrp
           with unique key vbeln
           with header line.
  select vbrk~vbeln
         vbrk~fkdat
         vbrk~fkart
         vbrk~kunag
         vbrk~knumv
         vbrk~inco1
         vbrk~spart
         vbrk~netwr
         vbrk~mwsbk
         vbrp~uepos
         vbrp~werks
         vbrp~lgort
         into table lt_rkrp
         from vbrk inner join vbrp
          on  vbrpvbeln = vbrkvbeln
         where vbrk~fkdat in s_fkdat
           and vbrk~bukrs eq p_bukrs.
Any problem in my select query? or with my table deifnition.
Can anyone pls suggest how to rectify this.

Answer 1

define a unique key VBELN and POSNR.
data lt_rkrp like hashed table of wa_rkrp
with unique key vbeln posnr
with header line.
BTW: Stop using the header line!!! Outdated!!
Edited by: Micky Oestreich on Mar 23, 2009 7:28 AM