User choosen entry in the drop-down list o

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Hello,

On the initial / main view am providing a input field with drop-down ability, i wrote the below code in INITIALIZATION event in order to fill the drop-down list, fine

  l_string = 'ZZ_PLANT'.
  w_l_element-value =  'NJ'.
  w_l_element-text  =  'PLANT_NEW_JERSEY'.

  APPEND w_l_element TO it_l_elements.
  CLEAR w_l_element.

  w_l_element-value =  'NY'.
  w_l_element-text  =  'PLANT_NEW_YORK'.

  APPEND w_l_element TO it_l_elements.
  CLEAR w_l_element.

  CALL METHOD node_info->set_attribute_value_set
    EXPORTING
      name      = l_string
      value_set = it_l_elements.

Working fine, when user clicks the drp-down (like F4) i am getting a table format popup with 2 colums, one is for VALUE (example data 'NJ') and the 2nd is for TEXT (example data is 'PLANT_NEW_JERSEY'), fine. As i hv given only 2 entries (NJ and NY) here, hence am getting 2 records in the popup table, fine.

Now, say the user has selected the 2nd record (NY), now, i need to CAPTURE that index (in this case it should be '2' as user has selected 2nd record) number/value in my prog. for some reason.

Pls let me know How to get the selected INDEX number/value in the drop-down list?

Tha nk you