Unable to set Data in MODEL NODE ??????

Hello All,
I have created a Web Dynpro application which makes RFC or BAPI calls.
I need to pass data to the BAPI as input parameter, but am failing to do so.
The Context structure for the model node is as follow -
Level1 - Z_Mm_XXX_Input
Level2 - Output_Repo
Level3 - T_Plants_Selected_Repo of structure type "Werks"
and supplying function "T_Plants_Selected"
This contains the model attribute as Werks.
Now i need to send this Werks attribute and pass it to the BAPI
I have written the following piece of code -
Z_Mm_XXX_Input zbapi_ip =
new Z_Mm_XXX_Input();
com.xxx.Werks plants_sel = new com.xxx.Werks();
plants_sel.setWerks("4522");
zbapi_ip.addT_Plants_Selected(plants_sel);
wdContext.nodeZ_Mm_Cmet_Report_Contrctr_Cse4_Input().bind(zbapi_ip);
The attributes for the model node Z_MM_XXX_input node is -.
cardinality - 0..1
selection - 0..1
singleton - true
The attributes for the model node Output_Repo node is -
cardinality - 0..1
selection - 0..1
singleton - true
The attributes for the model node T_Plants_Selected_Repo node is -
cardinality - 0..n
selection - 0..1
singleton - true
Still am not able to pass data to the model node.
Am really confused what could be the probable mistake.
Please let me know what have i missed out.
Thanks in advance,
Samta

hi,
i've the same problem,
i can't set my input data to the BAPI.
i've you the solution ?
thanks
PS here is a part of my code
public void executeBapi_Wd_Tut_Listuser_R3_Input( )
    //@@begin executeBapi_Wd_Tut_Listuser_R3_Input()
          try {
               Bapi_Wd_Tut_Listuser_R3_Input input =
                    new Bapi_Wd_Tut_Listuser_R3_Input();
               Zuname nom_start = new Zuname();
               Zuname nom_end = new Zuname();
               nom_start.setUname("P*"); //hard coded for the moment...
               nom_end.setUname("Q*");
               input.setUname(nom_start);
               input.setUname_End(nom_end);
               wdContext.nodeBapi_Wd_Tut_Listuser_R3_Input().bind(input);
               wdContext
                    .currentBapi_Wd_Tut_Listuser_R3_InputElement()
                    .modelObject()
                    .execute();
               // Synchronise the data in the context with the data in the model
               wdContext.nodeOutput().invalidate();

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