In XI mapping, how to get number from a number_range object in SAP R/3

Question

HI All,
I have a scenario where I need to read a Number_range object  in SAP R/3 or ABAP XI and retreive the current number.
I need to use this number during the message mapping.
(I read about JCO and RFC, but am a little confused about how-to and what is the correct approach)
Just to let you know, I do not want to pass this number in the original IDOC coming from IDOC, so I need this lookup.
Scenario:
In MM, make a call to SAP.
Get the latest number from SNRO( number-range object)
Use this number in mapping.
Any help pointers, greatly appreciated.
Many thanks
Shirin

Answer 1

Shrin,
Please find the parameters you need to specify while creating UDF
Imports:javax.xml.transform.stream.StreamResult;com.sap.aii.mapping.lookup.;javax.xml.transform.dom.DOMSource;javax.xml.parsers.DocumentBuilder;java.io.;javax.xml.parsers.;org.w3c.dom.;org.xml.sax.;javax.xml.transform.;
The Template for RFC Lookup
String content = "";
MappingTrace importanttrace;
importanttrace = container.getTrace() ;
//Filling the string with our RFC-XML (With Values)
String m = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><ns0:<Function Module name>xmlns:ns0=\"urn:sap-com:document:sap:rfc:functions\"></ns0:ZFI_GET_RUNID> ";
RfcAccessor accessor = null;
ByteArrayOutputStream out = null;
try
//1. Determine a channel (Business System, Communication channel)
Channel channel = LookupService.getChannel("<Business System Name>","Communication channel name");
//2. Get a RFC accesor for a channel.
accessor = LookupService.getRfcAccessor(channel);
//3. Create a xml input stream representing the FM request message.
InputStream inputstream = new ByteArrayInputStream(m.getBytes());
//4. Create xml Payload
XmlPayload payload  =  LookupService.getXmlPayload(inputstream);
//5. Execute Lookup
Payload result = accessor.call(payload);
InputStream in = result.getContent();
//This are the extra step which i dont know what it mean
//out = new ByteArrayOutputStream(1024);
//byte[] buffer = new byte[1024];
//for (int read = in.read(buffer); read > 0; read = in.read(buffer))
//out.write(buffer,0,read);
//content = out.toString();
try {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(in);
NodeList list = document.getElementsByTagName( "REsult" );
Node node = list.item(0);
if (node  != null)
     node = node.getFirstChild();
     if (node  != null)
          content = node.getNodeValue();
} catch (Exception e) {
importanttrace.addWarning("Error while closing accesor" + e.getMessage());
catch (LookupException e)
importanttrace.addWarning("Error While lookup" + e.getMessage());
//This exception is not to be catch at this step as there is no try step before this
//catch (IOException e)
//importanttrace.addWarning("Error" + e.getMessage());
finally
if(out!=null)
  try{
       out.close();
} catch (IOException e) {
importanttrace.addWarning("Error while closing system" + e.getMessage());
//7. close the accessor in order to free resources
if (accessor!=null) {
try{
      accessor.close();
} catch (Exception e) {
importanttrace.addWarning("Error while closing accesor" + e.getMessage());
return content;
Have mentioned in genric  where u need to specify the communication channel name, business service etc.,
Moreover there is a field result, which is the output returned from the FM