Löschen der letzen beiden Zeichen.

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ld_length = strlen( ld_string ) - 2.
ld_string = ld_string(ld_length).

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data lt_string type stringtab.
append 'test1' to lt_string.
append 'test2' to lt_string.
append 'test3' to lt_string.
concatenate lines of lt_string into ld_string separated by ','.

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data:
  lt_line type stringtab,
  lt_table type stringtab,
  lt_vbrk type standard table of vbrk,
  ld_string type string.
field-symbols:
  <ls_vbrk> type vbrk,
  <ld_string> type string,
  <la_field> type any.
refresh lt_table.
loop at lt_vbrk assigning <ls_vbrk>.
  refresh lt_line.
  do.
    assign component sy-index of structure <ls_vbrk> to <la_field>.
    if sy-subrc ne 0.
      exit.
    endif.
    append initial line to lt_line assigning <ld_string>.
    <ld_string> = <la_field>. "Hier braucht man eventuell noch eine etwas genauere Typumwandlung
  enddo.
  append initial line to lt_table assigning <ld_string>.
  concatenate lines of lt_line into <ld_string> separated by '|'.
endloop.
concatenate lines of lt_table into ld_string separated by cl_abap_char_utilities=>cr_lf.