Refreshing ALV when action is triggered using button

Question

Hello Friends,
I have a drop down list having 3 values "Last 30 Days", "Last 60 Days" and "Last 90 Days". If I select Last 30 Days and click on button "Search" it gives me record for the last 30 days. But, if I click again on "Last 60 Days" it duplicates the record that was already in. So it does not refresh the previous result. I have added the code as below to refresh ALV but, it refresh the table but not the ALV. My View name is "MY PO INVOICES" and the context node name is 'MY_PO_INV' .
DATA ln_node type REF TO if_wd_context_node.
ln_node = wd_context->get_child_node( 'MY_PO_INV' ).
ln_node->invalidate( ).
Please let me know how do I refresth the result in the ALV display when I trigger the event.
Thks & Rgds,
Hemal

Answer 1

Hello All,
Thanks very much for your responses. I tried to bind the alv table. But, I think I am doing some thing wrong here. Below is my code. Please let me know where I am doing wrong. Appreciate your help.
lv_thirtydays = 'LAST 30 DAYS'.
lv_sixtydays = 'LAST 60 DAYS'.
lv_ninetydays = 'LAST 90 DAYS'.
if ZDAYS = lv_thirtydays.
      lv_zpostingdate = sy-datum - 30.
      ENDIF.
lv_zpostingdate_to = sy-datum.
    if ZDAYS = lv_sixtydays.
       lv_zpostingdate = sy-datum - 60.
   ENDIF.
    if ZDAYS = lv_ninetydays.
       lv_zpostingdate = sy-datum - 90.
   ENDIF.
ln_node = wd_context->get_child_node( 'MY_PO_INV' ).
ln_node->invalidate( ).
LOOP AT lt_context_value_set INTO cocd_context_value_set.
   lv_zcompany = cocd_context_value_set-text.
   lv_zusername = username.
   lv_zdays = ZDAYS.
   CALL FUNCTION 'ZEBP_MY_PO_INV_SEARCH'
   EXPORTING
    bldat =                          lv_zpostingdate
    bldat_to =                      lv_zpostingdate_to
    bukrs =                         lv_zcompany
    usnam =                       lv_zusername
    ZDAYS =                      lv_zdays
   tables
    invsrch        = zsearch.
ln_node->bind_table( zsearch ) .
SORT zsearch BY zcompany.
DATA lo_nd_get_po_inv TYPE REF TO if_wd_context_node.
lo_nd_get_po_inv = wd_context->get_child_node( name = wd_this->wdctx_my_po_inv ).
CALL METHOD lo_nd_get_po_inv->bind_table
  EXPORTING
    new_items            = zsearch.
ENDLOOP.
Thks & Rgds,
Hemal