ABAP Mapping and Message Mapping

Question

Hello
I want to do the followig mapping
File - > IDOC
field1  ->field_idoc1
field2  ->field_idoc2
field3  ->field_idoc3
field4  -> (based on an dictionary table in the R/3)
For the first 3 fields I will use message-mapping.
For field4 I heard about ABAP Mapping. Select with the value of field4 in an ABAP Table and response the new value to the mapping back.
Would both mappings in one Interface-Mapping work?
Regards
Christoph

Answer 1

Christoph, There was an article previously available in articles section, now i dont find the link.
I have given a sample code below. You can find lot of sample JCO code provided along with the JCO library that can be downloaded from service.sap.com.
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( "sample", mConnection );
// Create function
JCO.Function function = null;
IFunctionTemplate ft = mRepository.getFunctionTemplate("Z_TEST");
function = ft.getFunction();
// Obtain parameter list for function
JCO.ParameterList input = function.getImportParameterList();
// Pass function parameters
input.setValue( param1_value , "P_PARM1");
input.setValue( param2_value , "P_PARM2");
JCO.ParameterList tabInput = function.getTableParameterList();
JCO.Table inputTable = tabInput.getTable("T_PARM3");
inputTable.appendRow();
inputTable.setValue("test" , "IDOC");
mConnection.execute( function );
String ret = function.getExportParameterList().getString( "P_GEN_NUM" );
mConnection.disconnect();
return ret ;
Regds
Saravana