Values not available in Table

Question

Hi
I have created one node  with attributes following properties and mapped to one view.
Cardinality = 0..n
Selection =  0..n
Fields :
f1 - Dropdown
f2
f3 - Date
f4
In the view, i created table and assigned to those fields. I wrote below code for insert record in table
  DATA : lt_ACTIONPLAN TYPE STANDARD TABLE OF ZST_ACTIONPLAN,
         wa_ACTIONPLAN TYPE ZST_ACTIONPLAN.
  DATA lo_nd_action_plan TYPE REF TO if_wd_context_node.
  DATA lo_el_action_plan TYPE REF TO if_wd_context_element.
  DATA ls_action_plan TYPE wd_this->element_action_plan.
navigate from <CONTEXT> to <ACTION_PLAN> via lead selection
  lo_nd_action_plan = wd_context->get_child_node( name = wd_this->wdctx_action_plan ).
  lo_el_action_plan = lo_nd_action_plan->get_element(  ).
wa_actionplan-f1 = 'hi'.
wa_actionplan-f2= 'mm'.
wa_actionplan-f3 = sy-datum.
wa_actionplan-f4 = 'test'.
append wa_actionplan to lt_ACTIONPLAN.
lo_nd_action_plan->BIND_ELEMENTS( NEW_ITEMS = lt_ACTIONPLAN ).
When i am execute my wdy applicaton, it shows following error
The following error text was processed in the system WLT : The ASSERT condition was violated.
Anyone help me

Answer 1

Hi Muthu
Check the following examples and used appropriate things in your program.
Accessing the Context Nodes and Node Elements at Runtime                    #
This document shows how to read, change, add, or delete               #
information stored in the controller context.                        
Assumption:
Node name is:      flights
View name is:      input_view
==============================================================
Accessing a Context Node
==============================================================
DATA: node_flights TYPE REF TO if_wd_context_node.
" get flight node via lead selection
node_flights = wd_context->get_child_node( name = 'FLIGHTS' ).
OR
node_flights = wd_context->get_child_node( name = if_input_view=>wdctx_flights ).
NOTE:
For each controller (<ctrl>), an interface is generated having the name IF_<ctrl>.
For each node <node> of a controller context, a constant (WDCTX_<node>) is generated in this interface; it has the name of the node (in uppercase letters) as its value. This constant can be used to access the context node.
==============================================================
Accessing Node Element
==============================================================
DATA:     node_flights TYPE REF TO if_wd_conext_node.
     elem_flights TYPE REF TO if_wd_context_element.
" Get flight node via lead selection
node_flights = wd_context->get_child_node( name = 'FLIGHTS' ).
" Get element via lead selection
elem_flights = node_flights->get_element( ).
" Handle exception if lead selection is not set
if ( elem_flights is initial ).
endif.
NOTE:
The element with index n can be accessed using the method get_element( index = n ) . The number of elements in a collection can be obtained from the method get_element_count( )
==============================================================
Summary
==============================================================
Action :      Ref. to node <node> of controller <ctrl>          
Method:     r_node = wd_context->get_child_element( name = if_<ctrl>=>wdctx_<node> ).
Action :      Reference to element at lead selection
Method:     r_element = r_node->get_element( ).
Action:     Reference to element with index n
Method:     r_element = r_node->get_element( index = n ).
Action:     Get number of elements in collection
Method:     n = r_node->get_element_count( ).
==============================================================
Accessing Attributes value of a Node Element
==============================================================
DATA:     node_flights TYPE REF TO if_wd_context_node,
     elem_flights TYPE REF TO if_wd_context_element,
     item_connid TYPE if_componentcontroller=>element_flights-connid,
     stru_flights TYPE if_componentcontroller=>element_flights,
     it_flights type if_componentcontroller=>elements_flight.
" Get node via lead selection
node_flights = wd_context->get_child_node( name = 'FLIGHTS' ).
" Get element via lead selection
elem_flights = node_flights->get_element( ).
" Get a single attribute value.
elem_flights->get_attribute(
     EXPORTING
          name = 'CONNID'
     IMPORTING
          value = item_connid ).
" Get all statically declared attributes
elem_flights->get_static_attributes(
     IMPORTING
          static_attributes = stru_flights ).
" Get all static attributes of all node element
node_flights->get_static_attributes_table(
     IMPORTING
          table = it_flights ).
NOTE:
For each node <node> of a controller context, a structure type
element_<node> is implicitly generated in the interface IF_<ctrl>. The structure fields correspond to the attributes a node element consists of. This constant can be used to type a variable, which is filled by the methods listed above.
In addition, for each node <node> of a controller context, a standard table type elements_<node> is implicitly generated in the interface IF_<ctrl>. The line type of this table is element_<node>. This constant can be used to type an internal table that can hold the attributes of multiple node elements.
==============================================================
Changing Attribute Values of a given Node Element
==============================================================
DATA:     node_flights TYPE REF TO if_wd_context_node,
     elem_flights TYPE REF TO if_wd_context_element,
     stru_flights if_componentcontroller=>element_flights.
" Get node via lead selection
node_flights = wd_context->get_child_node( name = 'FLIGHTS' ).
" Get element via lead selection
elem_flights = node_flights->get_element( ).
" Set single attriubute value
elem_flights->ser_attribute(
     EXPORTING
          name = 'CONNID'
          value = '0405' ).
" Set statically declared attributes
stru_flights-carrid = 'US'.
stru_flights_connid = '0017'.
elem_flights->set_static_attributes(
     EXPORTING
          static_attributes = stru_flights ).
==============================================================
Adding new Elements to a Context Node
==============================================================
DATA:     node_flights TYPE REF TO if_wd_context_node,
     first_flight_elem TYPE REF TO if_wd_context_element,
     stru_flights TYPE if_componentcontroller=>element_flights,
     it_flights TYPE if_componentcontroller=>elements_flights.
" Get node via lead selection
node_flights = wd_context->get_child_node( name = 'FLIGHTS' ).
" Create new node element for node FLIGHTS
first_flight_elem = node_flights->create_element( ).
" Set attribute values for newly created node element
first_flight_elem->set_attribute( name = 'CARRID' value = 'US' ).
first_flight_elem->set_attribute( name = 'CONNID' value = '0017' ).
" Bind newly created element to node
node_flights->bind_element(
     new_item = first_flight_elem
     set_initial_elements = abap_false ).
" Bind structure to node
stru_flights-carrid = 'US'.
stru_flights-connid = '0017'.
node_flights->bind_structure(
     new_item = stru_flights
     set_initial_elements = abap_false ).
" Bind internal table to node
stru_flights-carrid = 'US'.
stru_flights-connid = '0017'.
APPEND stru_flights TO it_flights.
stru_flights-carrid = 'AA'.
stru_flights-connid = '0055'.
APPEND stru_flights TO it_flights.
node_flights->bind_table( new_item = it_flights ).
NOTE:
The parameter SET_INITIAL_ELEMENTS allows to delete all existing elements of a node and bind only the actual element to the node. In this case the parameter must be set to abap_true (default value). If the structure should be added to the node as an additional element then the parameter must be set to abap_false.
==============================================================
Deleting Elements from a Context Node
==============================================================
DATA:     node_flights TYPE REF TO if_wd_context_node,
     elem_flights TYPE REF TO if_wd_context_element.
" Get node via lead selection
node_flights = wd_context->get_child_node( name = 'FLIGHTS' ).
" Get element via lead selection
elem_flights = node_flights->get_element( ).
" Remove element from node
node_flight = remove_element( element = elem_flights ).
IF STILL YOU ARE FINDING ANY PROBLEM TRY TO CHANGE THE CARDINALITY PROPERTY TO 1..N.