diff --git a/src/main/java/org/gcube/data/transfer/plugins/sis/SISPluginFactory.java b/src/main/java/org/gcube/data/transfer/plugins/sis/SISPluginFactory.java
index 1638c64..57f82f5 100644
--- a/src/main/java/org/gcube/data/transfer/plugins/sis/SISPluginFactory.java
+++ b/src/main/java/org/gcube/data/transfer/plugins/sis/SISPluginFactory.java
@@ -1,7 +1,6 @@
 package org.gcube.data.transfer.plugins.sis;
 
 import java.io.File;
-import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -24,8 +23,7 @@ public class SISPluginFactory extends AbstractPluginFactory<SisPlugin> {
 
 	static final Map<String,String> PARAMETERS_DESCRIPTION= new HashMap<String,String>();
 
-	static{
-		PARAMETERS_DESCRIPTION.put(SOURCE_PARAMETER, "[String value] Absolute path of source archive file.");
+	static{		
 		PARAMETERS_DESCRIPTION.put(GEONETWORK_CATEGORY, "[String value] GeoNetwork category for publiehd metadata. Default is 'Dataset'.");
 		PARAMETERS_DESCRIPTION.put(GEONETWORK_STYLESHEET, "[String value] GeoNetwork stylesheet for publiehd metadata. Default is '_none_'.");
 	}
@@ -36,12 +34,17 @@ public class SISPluginFactory extends AbstractPluginFactory<SisPlugin> {
 	}
 
 	@Override
-	public void checkInvocation(PluginInvocation arg0) throws ParameterException {
-		log.debug("Checking parameters for {} ",arg0);
+	public PluginInvocation checkInvocation(PluginInvocation arg0,String transferredFile) throws ParameterException {
+		log.debug("Setting default parameters for  {} ",arg0);
 		Map<String,String> params=arg0.getParameters();
-		if(params==null||params.isEmpty()||(!params.containsKey(SOURCE_PARAMETER)))
-			throw new ParameterException(SOURCE_PARAMETER+" is mandatory");
+		
+		if(params==null||params.isEmpty())	params=new HashMap<String,String>();
+		if(!params.containsKey(SOURCE_PARAMETER)) params.put(SOURCE_PARAMETER, transferredFile);
+		if(!params.containsKey(GEONETWORK_CATEGORY)) params.put(GEONETWORK_CATEGORY, "Dataset");
+		if(!params.containsKey(GEONETWORK_STYLESHEET)) params.put(GEONETWORK_STYLESHEET, "_none_");
 		String source=params.get(SOURCE_PARAMETER);
+		log.debug("Checking access to source {} ",source);
+		
 		if(source==null||source.length()==0) throw new ParameterException(SOURCE_PARAMETER+" cannot be null.");
 		try{
 			File f=new File(source);
@@ -52,6 +55,10 @@ public class SISPluginFactory extends AbstractPluginFactory<SisPlugin> {
 		}catch(Exception e){
 			throw new ParameterException("Unable to access source file ",e);
 		}
+		
+		arg0.setParameters(params);
+		return arg0;
+		
 	}
 
 	@Override
diff --git a/src/main/java/org/gcube/data/transfer/plugins/sis/SisPlugin.java b/src/main/java/org/gcube/data/transfer/plugins/sis/SisPlugin.java
index e8a83b1..b1d862b 100644
--- a/src/main/java/org/gcube/data/transfer/plugins/sis/SisPlugin.java
+++ b/src/main/java/org/gcube/data/transfer/plugins/sis/SisPlugin.java
@@ -39,8 +39,8 @@ public class SisPlugin extends AbstractPlugin {
 		
 		Map<String,String> params=invocation.getParameters();
 		String dataStorePath=params.get(SISPluginFactory.SOURCE_PARAMETER);
-		String category=params.containsKey(SISPluginFactory.GEONETWORK_CATEGORY)?params.get(SISPluginFactory.GEONETWORK_CATEGORY):"Dataset";
-		String stylesheet=params.containsKey(SISPluginFactory.GEONETWORK_STYLESHEET)?params.get(SISPluginFactory.GEONETWORK_STYLESHEET):"_none_";
+		String category=params.get(SISPluginFactory.GEONETWORK_CATEGORY);
+		String stylesheet=params.get(SISPluginFactory.GEONETWORK_STYLESHEET);
 		File dataStore=new File(dataStorePath);
 		log.debug("Extracting meta from {} ",dataStore.getAbsolutePath());
 		Metadata meta=getMetaFromFile(dataStore);