diff --git a/src/main/java/org/gcube/accounting/datamodel/basetypes/AbstractServiceUsageRecord.java b/src/main/java/org/gcube/accounting/datamodel/basetypes/AbstractServiceUsageRecord.java
index e0356d0..1ebecd4 100644
--- a/src/main/java/org/gcube/accounting/datamodel/basetypes/AbstractServiceUsageRecord.java
+++ b/src/main/java/org/gcube/accounting/datamodel/basetypes/AbstractServiceUsageRecord.java
@@ -5,6 +5,7 @@ package org.gcube.accounting.datamodel.basetypes;
 
 import java.io.Serializable;
 import java.util.Map;
+import java.util.SortedSet;
 
 import org.gcube.accounting.datamodel.BasicUsageRecord;
 import org.gcube.documentstore.exception.InvalidValueException;
@@ -65,8 +66,17 @@ public abstract class AbstractServiceUsageRecord extends BasicUsageRecord {
 	 */
 	@RequiredField @NotEmpty
 	public static final String CALLERQUALIFIER = "callerQualifier";												  
-	
-	
+	/**MODIFICA EFFETTUATA***/
+	@Override
+	public SortedSet<String> getQuerableKeys()
+					throws Exception {
+		SortedSet<String> properties = super.getQuerableKeys();
+
+		properties.remove(CALLERQUALIFIER);
+		
+		
+		return properties;
+	}
 	
 	
 	public AbstractServiceUsageRecord(){
@@ -143,4 +153,5 @@ public abstract class AbstractServiceUsageRecord extends BasicUsageRecord {
 		setResourceProperty(CALLERQUALIFIER, callerQualifier);
 	}
 	
+	
 }