How to get the contents of more than one comments of human task?

Question

The human task have more than one comments. I use the following functions to get the contents but still only get the first comment. Append function only returns the first comment.
How to get all conents of comments?
<while name="While_1"
condition="bpws:getVariableData('Variable_int_i')&lt;number(bpws:getVariableData('Variable_comment_node'))">
<sequence name="Sequence_3">
<sequence name="Sequence_3">
<assign name="Assign_7">
<copy>
<from expression="string(bpws:getVariableData('single_approve_1_globalVariable','payload','/task:task/task:userComment/task:comment'))"/>
<to variable="Variable_comment_string"/>
</copy>
</assign>
<assign name="Assign_6">
<copy>
<from expression="bpws:getVariableData('Variable_int_i')+1"/>
<to variable="Variable_int_i"/>
</copy>
</assign>
</sequence>
</sequence>
</while>

Answer 1

You also have to test the value:
REPORT ztest MESSAGE-ID 00.
DATA: BEGIN OF itab OCCURS 0,
        f1 TYPE i,
        f2 TYPE i,
        f3 TYPE i,
        f4 TYPE i,
      END OF itab.
DATA: sel_field(20),
      value TYPE i.
DO 5 TIMES.
  itab-f1 = sy-index.
  itab-f2 = sy-index + 10.
  itab-f3 = sy-index + 20.
  itab-f4 = sy-index + 30.
  APPEND itab.
ENDDO.
LOOP AT itab.
  WRITE: /001 itab-f1, itab-f2, itab-f3, itab-f4.
  HIDE itab.
  CLEAR itab.
ENDLOOP.
AT LINE-SELECTION.
  CLEAR: sel_field,
         value.
  GET CURSOR FIELD sel_field.
  IF sy-subrc = 0.
    CASE sel_field.
      WHEN 'ITAB-F1'.
        value = itab-f1.
      WHEN 'ITAB-F2'.
        value = itab-f2.
      WHEN 'ITAB-F3'.
        value = itab-f3.
      WHEN 'ITAB-F4'.
        value = itab-f4.
    ENDCASE.
    MESSAGE s001 WITH 'Value of' sel_field 'is' value.
  ELSE.
    MESSAGE s001 WITH 'Invalid field selected'.
  ENDIF.
Rob