Problem in triggering the Supply Function

Hi Experts,
I am developing one web dynpro application to display the records in MARA table.
I have created a radio button.Logic is if radio button is selected then displaying of the record should be done.
NODE_PARENT consists of NODE_CHILD ( which consists of fields to be displayed ) and key holder ( attribute which is used to check whether radio button selected or not ).
In radio button properties i used selected key as attribute of the node NODE_PARENT.
Now in supply function i am reading the parent element attributes i.e. radio button and checking if it is selected then read the data from MARA and bind it.
But i am getting the runtime error
" Context binding of property SELECTED_KEY cannot be resolved: Node MAIN.1.NODE_PARENT does not contain any elements "
what is the reason for this error.
Thanks in advance.

Hi Kissnas and other experts ,
Here is the code.
DATA lo_nd_node_parent TYPE REF TO if_wd_context_node.
DATA lo_el_node_parent TYPE REF TO if_wd_context_element.
DATA ls_node_parent TYPE wd_this->element_node_parent.
DATA lv_keyholder LIKE ls_node_parent-keyholder.
DATA itab TYPE TABLE OF mara.
navigate from <CONTEXT> to <NODE_PARENT> via lead selection
lo_nd_node_parent = wd_context->get_child_node( name = wd_this->wdctx_node_parent ).
@TODO handle not set lead selection
IF lo_nd_node_parent IS INITIAL.
ENDIF.
get element via lead selection
lo_el_node_parent = lo_nd_node_parent->get_element( ).
@TODO handle not set lead selection
IF lo_el_node_parent IS INITIAL.
ENDIF.
alternative access via index
lo_el_node_parent = lo_nd_node_parent->get_element( index = 1 ).
@TODO handle non existant child
IF lo_el_node_parent IS INITIAL.
ENDIF.
get single attribute
lo_el_node_parent->get_attribute(
 EXPORTING
 name = `KEYHOLDER`
 IMPORTING
 value = lv_keyholder ).
IF ( lv_keyholder EQ 'X' ).
 SELECT matnr ersda ernam FROM mara INTO CORRESPONDING FIELDS OF TABLE itab." WHERE mandt = sy-mandt.
ENDIF.
bind all the elements
node->bind_table( itab ).
*lt_node_table->bind_table( itab ).
I have written this code in supplyfunction GET_DATA.
Regards
Ravindranath CH

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2.Don't use the supply method use the method which belongs to the inbount-plug called handle......
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Message was edited by: Klaus Helfrich
Message was edited by: Klaus Helfrich

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Hi Ranveer,
Each context node of a controller can be assigned a supply function. This supply
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Supply Functions of Singleton Nodes
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data: CARR_ATTR type IF_MAINVIEW=>ELEMENT_CARRIER_NODE,
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get filled structure for parent node
PARENT_ELEMENT->GET_STATIC_ATTRIBUTES( importing
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get connections from help class
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Explanation:
An internal variable of the type of a context element of the parent node
CARRIER_NODE and another internal variable of the Dictionary type SPFLI_TAB are
declared.
● The attribute values of the lead selection element of the parent node CARRIER_NODE
are then passed to the internal variable CARR_ATTR.
For this transfer, each supply function uses the parameter
PARENT_ELEMENT of the reference type IF_WD_CONTEXT_ELEMENT.
PARENT_ELEMENT is a reference to the lead selection element of the parent node of
the current node. The parameter is automatically displayed in the signature of the
supply function.
Each time the user selects another table element as the lead selection in the table Carrier,
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node CONNECTION_NODE is called and the values of its attributes are newly filled
according to the selected table line in the table Carrier.
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