Coud u tell what is the need of Date_Stamp in the target structure.
If it is for naming the file then instead u can use Dynamic configuration and Adapter specific Message Attributes. Using this you can have your filename and file directory assigned dynamically need for variable substitution.
1. Discard or dont map the field Date_Stamp in target structure.
2. create a UDF as in code below .
3. go to advanced tab of receiver channel to select Adapter Specific Message Attributes indicator.
4. Tick the indicator u want from the message header i.e either FileName or Directory etc
code :
// get the dynamic values from the container object
DynamicConfiguration conf = (DynamicConfiguration) container.getTransformationParameters().get(StreamTransformationConstants.DYNAMIC_CONFIGURATION);
// create a key to access the Filename parameter
DynamicConfigurationKey key = DynamicConfigurationKey.create("http://sap.com/xi/XI/System/File","FileName");
//below you access the file name from header if it was set in the sender file channel
//String filename= conf.get(key);
String fileName = dateStamp; // date stamp is an input field to the UDF
// Here you set the fileName(ur datestamp) in the Header of the message
conf.put(key, fileName);
//For Directory settings you can do the same as above
String directory = "Xi/Directory";
key = DynamicConfigurationKey.create("http://sap.com/xi/XI/System/File","Directory");
conf.put(key, directory);
return fileName;
5. When u use this UDF in Mapping map the o/p of this UDF to a dummy node (a root node may be) in the target structure . This is because the UDF is returning a value. Although this value is not required to prevent exception map it to the root node.
Hope it helps
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