How to keep incoming IDoc-No.?!

Question

Hi, i am a freshman and i need some help!
Because we send IDoc from R/3 to R/3 across XI we want to have the same IDoc-No. in receiver system like it was given in sender system.
We already activated the checkbox "Apply control record values from payload" but when we check in IDX5 the inbound and outbound idoc-no. differs.
I read that this should be possible to achieve that the inbound and outbound no are the same! How can i achieve this solution?!
Can u help me!?
br

Answer 1

Ok, now i want to do a RFC-Lookup to the Table IDXRCVPOR for getting the original incoming IDoc-Number.
I use this code in field-mapping:
String DBTABLE = a[0];
String lookUpField = d[0];
String WHERE_CLAUSE = b[0]+" = "+"'"+c[0]+"'" ;
String sapClient = "100";
String hostName = "server";
String systemNumber = "00";
String userName = "USER";
String password = "PW";
String language = "EN";
JCO.Repository mRepository;
JCO.Client mConnection = JCO.createClient(
               sapClient,
               userName,
               password,
               language,
               hostName,
               systemNumber );
// 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");
for (int i = 0; i < valueSet.getNumRows(); i++)
          valueSet.setRow(i);
          String resultSet [] = valueSet.getString("WA").split(",(?=(?:[^\"]*\"[^\"]*\")*(?![^\"]*\"))");
          result.addValue(resultSet[pos]);
mConnection.disconnect();
But when i try a test in mapping i am getting this error:
Runtime exception during processing target field mapping /SYSTAT01/IDOC/E1STATS/DOCNUM. The message is: Exception:[com.sap.mw.jco.JCO$Exception: (104) RFC_ERROR_SYSTEM_FAILURE: A dynamically specified column name is unknown.]
Can somebody help me again?!