List box values in module pool

Hi All,
Plz help me out in this regard..
I have designed a screen with 20 list boxes around and i am getting values for list boxes also.the main problem is coming when after selecting values....
that is after selecting values if i press enter on the screen the values are over written by space..
The default value for list boxes are space.
how to over come this problem...Plz help me out
Regards,
Sudha

PAI
MODULE user_command_1000 INPUT.
CASE sy-ucomm.
WHEN 'SAVER'.
         IF zrule_date_from > zrule_date_to.
            MESSAGE e000 WITH : 'RUN_VALIDITY_TO_DATE can not be Less'(001)
                                'Than RUN_VALIDITY_FROM_DATE'(002).
            EXIT.
         ENDIF.
         IF zrule_date_to < sy-datum.
            MESSAGE e000 WITH : 'RUN_VALIDITY_TO_DATE can not be Less'(003)
                                'Than System Date.'(004).
            EXIT.
         ENDIF.
         wa_rule-zrule_date_from = zrule_date_from.
         wa_rule-zrule_date_to    = zrule_date_to.
         wa_rule-zrule_name       = zrule_name.
         wa_rule-zrule_id         = zrule_id.
         wa_rule-zrule_pref       = zrule_pref.
ONCATENATE 'Where' rule_for1a operator1a values1a
             andor1 rule_for2a operator2a values2a
             andor2 rule_for3a operator3a values3a
             andor3 rule_for4a operator4a values4a
             andor4 rule_for5a operator5a values5a
             andor5 rule_for6a operator6a values6a
             andor6 rule_for7a operator7a values7a
             andor7 rule_for8a operator8a values8a
                      INTO wa_rule-zrule_clause SEPARATED BY space.
In this code andor6(7,8,etc) has (and or)
and operator8a(7a,6a etc) has (+,- <,>) and when i do enter these two get cleared. why does this happen?
MY PBO code is
MODULE status_1000 OUTPUT.
SET PF-STATUS 'RULE'.
SET TITLEBAR '1000'.
ENDMODULE.                 " STATUS_1000 OUTPUT
*&      Module fill_lists OUTPUT
For Filling List Boxes
MODULE fill_lists OUTPUT.
**********1
    name       = 'ANDOR1'.
    value-key = 1.
    value-text = 'AND'.
    MOVE value-text TO value-text.
    APPEND value TO list.
    value-key = 2.
    value-text = 'OR'.
    MOVE value-text TO value-text.
    APPEND value TO list.
    PERFORM LIST_BOX.
    CLEAR LIST.
**************2
    name       = 'ANDOR2'.
    value-key = 1.
    value-text = 'AND'.
    MOVE value-text TO value-text.
    APPEND value TO list.
    value-key = 2.
    value-text = 'OR'.
    MOVE value-text TO value-text.
    APPEND value TO list.
    PERFORM LIST_BOX.
    CLEAR LIST.
************3
    name       = 'ANDOR3'.
    value-key = 1.
    value-text = 'AND'.
    MOVE value-text TO value-text.
    APPEND value TO list.
    value-key = 2.
    value-text = 'OR'.
    MOVE value-text TO value-text.
    APPEND value TO list.
    PERFORM LIST_BOX.
    CLEAR LIST.
etc.

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Message was edited by:
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