java - Why does SAP JCo raise an error "Field ... not a member of ..." even though the field exists? -

i want send data sap rfc table servlet application.

i trying below way.

jco.function function = null; connection conn = new connection(); jco.client mconnection = conn.open(); jco.repository mrepository; mconnection.connect();  mrepository = new jco.repository("keyword",mconnection);  try{     function = this.createfunction("my rfc name");     if(function != null){          function.getimportparameterlist.setvalue("id1","userid");          function.getimportparameterlist.setvalue("test name","uname");          function.getimportparameterlist.setvalue("classa","uclass");           mconnection.execute(function);     } }catch(exception ex){     // exception handling goes here. } conn.disconnected(); 

but getting following error

com.sap.mw.jco.jco$exception:<127> jco_error_field_not_found: field userid not member of input

but checked, there exist column in sap.

what missing here? should pass rfc table name also? how?

i solve question following code.

jco.function function = null; connection conn = new connection(); jco.client mconnection = conn.open(); jco.table get_data = null; jco.repository mrepository; mconnection.connect();  mrepository = new jco.repository("keyword",mconnection);  try{     function = this.createfunction("my rfc name");     if(function != null){           get_data = function.gettableparameterlist.gettable(table_name);          get_data.appendrow();           function.getimportparameterlist.setvalue("id1","userid");          function.getimportparameterlist.setvalue("test name","uname");          function.getimportparameterlist.setvalue("classa","uclass");           get_data.nextrow();          mconnection.execute(function);     } }catch(exception ex){     // exception handling goes here. } conn.disconnected();