Multi_no_lead and cardinality conflict

Question

Hi,
I have a problem with "multi_no_lead" and "cardinality". The node which i bind with my ALV has 0..n cardinality and 0..n selection.
I must choose more than one rows, then i have added these codes : 
CALL METHOD l_value->if_salv_wd_table_settings~set_selection_mode
    EXPORTING
      value = cl_wd_table=>e_selection_mode-multi_no_lead.
With Event1 i read the selected more than one rows and change the data. It works.
But now i want to see the details of only one selected row with a different event(Event2).This event reads just the context but it doesn't work. I take that error :
"Adapter error in &VIEW_ELEMENT_TYPE& "PER_IN" of view "/XXX/XX_WEB.EXPENSE_DETAIL": Context binding of property VALUE cannot be resolved: Lead selection not set for context node EXPENSE_DETAIL.1.GT_MAIN"
How can i solve it?
Thanks...

Answer 1

Hi Adi,
Regarding your problem that you have add the alv table a column and give it "link". When you click that link,you want to show the details of selected line. But it doesn't work and gives that error.
For this you will do one thing .
Take the ALV event ON_CLICK and within you will get the index of row for which you click the link.
After this you can read the context node and based on the index you can read the data from the context node.
Suppose I hv created a employee details node EMP_DETAIL in the component controller.
and I hv mapped to the view controller.
Navigate to the methods tab of view  and create event handler method onClick for the On_CLICK event of the ALV component in the view.
This ON_CLICK  is type ref of IF_SALV_WD_TABLE_CLICK interface .
The  check this code.
METHOD on_click .
  DATA lo_nd_emp_detail TYPE REF TO if_wd_context_node.
  DATA lo_el_emp_detail TYPE REF TO if_wd_context_element.
  DATA lt_emp_detail TYPE wd_this->elements_emp_detail.
  DATA ls_emp_detail LIKE LINE OF lt_emp_detail.
  DATA lv_index TYPE i.
  navigate from <CONTEXT> to <EMP_DETAIL> via lead selection
  lo_nd_emp_detail = wd_context->get_child_node( name = wd_this->wdctx_emp_detail ).
  @TODO handle not set lead selection
  IF lo_nd_emp_detail IS INITIAL.
  ENDIF.
  get all declared attributes
  lo_nd_emp_detail->get_static_attributes_table(
    IMPORTING
      table = lt_emp_detail ).
  lv_index = r_param->index.
  READ TABLE lt_emp_detail INTO ls_emp_detail INDEX lv_index .
ENDMETHOD.
You can also check this link [Using ON_CLICK Event in the ALV Table|https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/bd28494a-0801-0010-45a3-fc359d82d3e8]
Regard
Manoj Kumar