How to refresh the ALV Control

Hi Experts,
I have a selection screen and ALV control in webdydnpro report. If i enter valid input values in the selection screen the ALV contol is diplaying datas correctly but when i enter invalid data in the selection screen the ALV table control values still diplaying in the previous datas. I need to Refresh the ALV contol values once the incorrect data enter in the selection screen. How can i REFRESH the ALV control in Webdynpro report. I have Refreh button in the Selection screen when you press REFRESH button the ALV table control data should be initilize Kindly help me out this issue.
Thanks ,
Kumar

Hi.
You have a selection screen where user can enter some data, with this data you
perform a selection and then you bind the result to the ALV, right?
Question is how you bind the result to ALV? Do you use external context mapping
or the set_data method ?
So I guess you have a method where you validate the select options and if they
are correct you perform the selction and bind the result to the node for the ALV. If
the select options are incorrect you just need to get the node for the ALV (which contains the
previous result )and call the invalidate method on that node which deletes all
elements of this node and after that the ALV should be empty again.

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hi experts,
i used bapi to update the changes made in data of table control in modulepool.
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refresh : itab.
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TYPE-POOLS : SLIS.
* Tables *
TABLES:
VBRK,
VBRP.
* Parameters and select options OR SELECTION SCREEN
SELECTION-SCREEN BEGIN OF BLOCK B1 WITH FRAME TITLE TEXT-001.
SELECT-OPTIONS:
 S_VBELN FOR VBRK-VBELN.
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 VBELN LIKE VBRK-VBELN,
 POSNR LIKE VBRP-POSNR,
 UEPOS LIKE VBRP-UEPOS,
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 MEINS LIKE VBRP-MEINS.
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 GC_CUSTOM_CONTROL_NAME TYPE SCRFNAME VALUE 'CC_ALV',
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 GS_LAYOUT TYPE LVC_S_LAYO,
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AT SELECTION-SCREEN.
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TOP-OF-PAGE.
* END-OF-PAGE *
END-OF-PAGE.
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* text
* --> p1 text
* <-- p2 text
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FROM VBRK
INTO VBRK-VBELN
WHERE VBELN IN S_VBELN.
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 MESSAGE E000 WITH 'no billing documents found'.
ENDIF.
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* text
* --> p1 text
* <-- p2 text
FORM GET_DATA .
SELECT VBELN
 POSNR
 UEPOS
 FKIMG
 NETWR
 MEINS
FROM VBRP
INTO TABLE IT_VBRP
WHERE VBELN IN S_VBELN.
ENDFORM. " GET_DATA
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* text
MODULE DISPLAY_ALV OUTPUT.
IF V_FLAG = 'X'.
 PERFORM DISPLAY_ALV.
 PERFORM PREPARE_FIELD_CATALOG CHANGING GT_FIELDCAT.
 PERFORM PREPARE_LAYOUT CHANGING GS_LAYOUT.
 CALL METHOD GR_ALVGRID->SET_TABLE_FOR_FIRST_DISPLAY
 EXPORTING
* I_BUFFER_ACTIVE =
* I_BYPASSING_BUFFER =
* I_CONSISTENCY_CHECK =
* I_STRUCTURE_NAME = 'VBRP'
* IS_VARIANT =
* I_SAVE =
* I_DEFAULT = 'X'
 IS_LAYOUT = GS_LAYOUT
* IS_PRINT =
* IT_SPECIAL_GROUPS =
* IT_TOOLBAR_EXCLUDING =
* IT_HYPERLINK =
* IT_ALV_GRAPHICS =
* IT_EXCEPT_QINFO =
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 IT_OUTTAB = IT_VBRP[]
 IT_FIELDCATALOG = GT_FIELDCAT
* IT_SORT =
* IT_FILTER =
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 PROGRAM_ERROR = 2
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 OTHERS = 4
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* IS_STABLE =
* I_SOFT_REFRESH =
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* text
* --> p1 text
* <-- p2 text
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* text
* <--P_GT_FIELDCAT text
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LS_FCAT-OUTPUTLEN = '10'.
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CLEAR LS_FCAT.
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LS_FCAT-FIELDNAME = 'POSNR'.
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LS_FCAT-COL_POS = L_POS.
LS_FCAT-SCRTEXT_M = 'Billing Item'.
LS_FCAT-OUTPUTLEN = '6'.
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LS_FCAT-COL_POS = L_POS.
LS_FCAT-SCRTEXT_M = 'Higher Level Item'.
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LS_FCAT-SCRTEXT_M = 'Invoice Quantity'.
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LS_FCAT-COL_POS = L_POS.
LS_FCAT-SCRTEXT_M = 'Net Value'.
LS_FCAT-OUTPUTLEN = '15'.
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LS_FCAT-FIELDNAME = 'MEINS'.
LS_FCAT-TABNAME = 'IT_VBRP'.
LS_FCAT-COL_POS = L_POS.
LS_FCAT-SCRTEXT_M = 'Unit of Measure'.
LS_FCAT-OUTPUTLEN = '3'.
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CLEAR LS_FCAT.
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* text
* <--P_GS_LAYOUT text
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P_GS_LAYOUT-GRID_TITLE = 'INVOICE DETAILS'.
P_GS_LAYOUT-SMALLTITLE = 'X'.
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* text
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SET PF-STATUS 'CANCEL'.
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* text
MODULE USER_COMMAND_0100 INPUT.
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 ENDIF.
ENDCASE.
Regards,
Aswin

How to refresh the panel's display in listener?

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