Mapping Exception Issue with RFC LookUp

Question

Hi,
My scenario is Idoc To file, in my idoc user who created a purchase order filed is not there but in xml file i want the user who create that PO, for this i am using RFC LooUp. I want the user who created a purchase order.
Graphical Mapping looks like below.
Belnr-->User Defined Function--
>UserName
Please find the code bloew:
String DBTABLE = "EKKO";
String lookUpField = "ERNAM";
String WHERE_CLAUSE = " EBELN "" = "" ' "a" ' " ;
JCO.Repository mRepository;
JCO.Client mConnection = JCO.createClient(
               "500",
                "RFCUSER",
               "abc1234",
               "EN",
               "cxylo06",
               "05");
// connect to SAP
mConnection.connect();
// create repository
mRepository = new JCO.Repository( "GenericRFCMappingLookup", mConnection );
// create function template to select data from any table
JCO.Function function = null;
IFunctionTemplate ft = mRepository.getFunctionTemplate("RFC_READ_TABLE");
function = ft.getFunction();
// Obtain parameter list for function
JCO.ParameterList input = function.getImportParameterList();
// Pass function parameters
// set import parameters table name and RFC
input.setValue( DBTABLE, "QUERY_TABLE");
input.setValue( "," , "DELIMITER");
//Fill the where clause of the table
JCO.ParameterList tabInput = function.getTableParameterList();
JCO.Table inputTable = tabInput.getTable("OPTIONS");
inputTable.appendRow();
inputTable.setValue(WHERE_CLAUSE,"TEXT");
mConnection.execute( function );
//Find the position of the field that has to be lookedUp
JCO.Table lookupFieldPos = function.getTableParameterList().getTable("FIELDS");
int pos = -1;
for (int i = 0; i < lookupFieldPos.getNumRows(); i++)
          lookupFieldPos.setRow(i);
          if (lookupFieldPos.getString("FIELDNAME").equals(lookUpField))
          pos = i;
//Get the exact lookupvalue from the position obtained above
JCO.Table valueSet = function.getTableParameterList().getTable("DATA");
valueSet.setRow(0);
String resultSet = valueSet.getString("WA");
result.addValue(resultSet);
mConnection.disconnect();
I am not aware of java coding so kindly make necessary  modifications.
Kindly suggest what changes i need to do to execute perfectly.
Your help will be greatly apprecited.
Regards,
Venkat

Answer 1

Hi Venkat,
     If you use the JCO connection to get the value from RFC, it would be a problem in futherly like when you move this interface DEV to Q, then you need to change the connection parameters to establish the JCO connection.Same in Production environment too.It is not advisable to do JCO lookup. Go for RFC lookup as the link given by Farooq.
Create Reciever RFC communication channel and take the XML signature of u r RFC by importing that RFC under imported objects.Create an UDF, for this see the sample code which is exisitng in document to pass the Export parameter to RFC.
In this way u r RFC channel establish the connection to R3 and your RFC will execute and return the value.U just need to change the Reciever RFC channel parameters respective of environment.
Cheers
Veera