diff --git a/src/main/java/org/gcube/accounting/datamodel/BasicUsageRecord.java b/src/main/java/org/gcube/accounting/datamodel/BasicUsageRecord.java
index b49ead6..ebd694a 100644
--- a/src/main/java/org/gcube/accounting/datamodel/BasicUsageRecord.java
+++ b/src/main/java/org/gcube/accounting/datamodel/BasicUsageRecord.java
@@ -44,12 +44,23 @@ public abstract class BasicUsageRecord implements UsageRecord, Serializable {
 	
 	private static Logger logger = LoggerFactory.getLogger(BasicUsageRecord.class);
 	
+	/**
+	 * An unique identifier for the UsageRecord
+	 */
 	@RequiredField @NotEmpty
 	public static final String ID = "id";
+	/**
+	 * The user (or the Consumer Identity, that in the S2S communication is 
+	 * another service) actually consuming the resource 
+	 */
 	@RequiredField @NotEmpty
 	public static final String CONSUMER_ID = "consumerId";
+	/**
+	 * When the UR was created 
+	 */
 	@RequiredField @ValidLong
 	public static final String CREATION_TIME = "creationTime";
+	
 	@RequiredField @NotEmpty
 	protected static final String USAGE_RECORD_TYPE = "usageRecordType";
 	@RequiredField @NotEmpty
diff --git a/src/main/java/org/gcube/accounting/datamodel/aggregation/aggregationstrategy/StorageUsageRecordAggregationStrategy.java b/src/main/java/org/gcube/accounting/datamodel/aggregation/aggregationstrategy/StorageUsageRecordAggregationStrategy.java
index cb9b406..d39addc 100644
--- a/src/main/java/org/gcube/accounting/datamodel/aggregation/aggregationstrategy/StorageUsageRecordAggregationStrategy.java
+++ b/src/main/java/org/gcube/accounting/datamodel/aggregation/aggregationstrategy/StorageUsageRecordAggregationStrategy.java
@@ -19,9 +19,9 @@ public class StorageUsageRecordAggregationStrategy extends AggregationStrategy<S
 	public StorageUsageRecordAggregationStrategy(StorageUsageRecord storageUsageRecord) {
 		super(storageUsageRecord);
 		this.aggregationField.add(StorageUsageRecord.RESOURCE_OWNER);
-		this.aggregationField.add(StorageUsageRecord.OBJECT_URI);
+		this.aggregationField.add(StorageUsageRecord.RESOURCE_SCOPE);
 		this.aggregationField.add(StorageUsageRecord.OPERATION_TYPE);
-		this.aggregationField.add(StorageUsageRecord.QUALIFIER);
+		this.aggregationField.add(StorageUsageRecord.OBJECT_URI);
 		this.aggregationField.add(StorageUsageRecord.DATA_TYPE);
 	}
 
diff --git a/src/main/java/org/gcube/accounting/datamodel/implementations/StorageUsageRecord.java b/src/main/java/org/gcube/accounting/datamodel/implementations/StorageUsageRecord.java
index 466fd36..6237b4a 100644
--- a/src/main/java/org/gcube/accounting/datamodel/implementations/StorageUsageRecord.java
+++ b/src/main/java/org/gcube/accounting/datamodel/implementations/StorageUsageRecord.java
@@ -4,6 +4,7 @@
 package org.gcube.accounting.datamodel.implementations;
 
 import java.io.Serializable;
+import java.net.URI;
 import java.util.Map;
 
 import org.gcube.accounting.datamodel.BasicUsageRecord;
@@ -14,6 +15,7 @@ import org.gcube.accounting.datamodel.validations.annotations.NotEmptyIfNotNull;
 import org.gcube.accounting.datamodel.validations.annotations.ValidIP;
 import org.gcube.accounting.datamodel.validations.annotations.ValidLong;
 import org.gcube.accounting.datamodel.validations.annotations.ValidOperationType;
+import org.gcube.accounting.datamodel.validations.annotations.ValidURI;
 import org.gcube.accounting.exception.InvalidValueException;
 
 /**
@@ -27,29 +29,30 @@ public class StorageUsageRecord extends BasicUsageRecord implements SingleUsageR
 	 */
 	private static final long serialVersionUID = 1381025822586583326L;
 
-	/*
-	 * Actually workspace uses
-	 * DOWNLOAD, UPLOAD, COPY, MOVE, DELETE,
-	 */
 	public enum OperationType {
-		GET, PUT, UPDATE, DELETE
+		CREATE, READ, UPDATE, DELETE, COPY, MOVE
 	}
 	
-	@NotEmpty
+	@RequiredField @NotEmpty
 	public static final String RESOURCE_OWNER = "resourceOwner";
+	@RequiredField @NotEmpty
+	public static final String RESOURCE_SCOPE = "resourceScope";
+	
+	/*
 	@NotEmptyIfNotNull
 	public static final String PROVIDER_ID = "providerId";
-	@NotEmptyIfNotNull
+	*/
+	@RequiredField @NotEmptyIfNotNull @ValidURI
 	public static final String OBJECT_URI = "objectURI";
 	@RequiredField @ValidOperationType
 	public static final String OPERATION_TYPE = "operationType";
-	@NotEmpty
-	public static final String QUALIFIER = "qualifier";
-	@NotEmpty
+	@RequiredField @NotEmpty
 	public static final String DATA_TYPE = "dataType";
 	@RequiredField @ValidLong
 	public static final String DATA_VOLUME = "dataVolume";
 	
+	@NotEmpty
+	public static final String QUALIFIER = "qualifier";
 	@ValidIP
 	public static final String CALLER_IP = "callerIP";
 	
@@ -62,27 +65,43 @@ public class StorageUsageRecord extends BasicUsageRecord implements SingleUsageR
 	}
 	
 	/**
-	 * Return the identity id of the accounting owner
-	 * @return The identity id of the accounting owner
+	 * Return the identity id of the storage resource owner
+	 * @return the identity id of the accounting owner
 	 */
 	public String getResourceOwner() {
 		return (String) this.resourceProperties.get(RESOURCE_OWNER);
 	}
 	
 	/**
-	 * Set the identity id of the accounting owner
-	 * @param ownerID The identity id of the accounting owner
+	 * Set the identity id of the storage resource owner
+	 * @param ownerID the identity id of the storage resource owner
 	 * @throws InvalidValueException
 	 */
-	public void setResourceOwner(String owner) throws InvalidValueException {
+	public void setResourceScope(String owner) throws InvalidValueException {
 		setResourceProperty(RESOURCE_OWNER, owner);
 	}
+	/**
+	 * Return the scope of the storage resource
+	 * @return The scope id of the storage resource
+	 */
+	public String getResourceScope() {
+		return (String) this.resourceProperties.get(RESOURCE_OWNER);
+	}
 	
-	public String getObjectURI() {
-		return (String) this.resourceProperties.get(OBJECT_URI);
+	/**
+	 * Set the scope of the storage resource
+	 * @param scope the scope of the storage resource
+	 * @throws InvalidValueException
+	 */
+	public void setResourceOwner(String scope) throws InvalidValueException {
+		setResourceProperty(RESOURCE_SCOPE, scope);
+	}
+	
+	public URI getObjectURI() {
+		return (URI) this.resourceProperties.get(OBJECT_URI);
 	}
 
-	public void setObjectURI(String objectURI) throws InvalidValueException {
+	public void setObjectURI(URI objectURI) throws InvalidValueException {
 		setResourceProperty(OBJECT_URI, objectURI);
 	}
 	
@@ -102,6 +121,7 @@ public class StorageUsageRecord extends BasicUsageRecord implements SingleUsageR
 		setResourceProperty(CALLER_IP, callerIP);
 	}
 	
+	/*
 	public String getProviderId() {
 		return (String) this.resourceProperties.get(PROVIDER_ID);
 	}
@@ -109,6 +129,7 @@ public class StorageUsageRecord extends BasicUsageRecord implements SingleUsageR
 	public void setProviderId(String providerId) throws InvalidValueException {
 		setResourceProperty(PROVIDER_ID, providerId);
 	}
+	*/
 	
 	public String getQualifier() {
 		return (String) this.resourceProperties.get(QUALIFIER);
diff --git a/src/main/java/org/gcube/accounting/datamodel/validations/annotations/ValidURI.java b/src/main/java/org/gcube/accounting/datamodel/validations/annotations/ValidURI.java
new file mode 100644
index 0000000..3d626bc
--- /dev/null
+++ b/src/main/java/org/gcube/accounting/datamodel/validations/annotations/ValidURI.java
@@ -0,0 +1,16 @@
+package org.gcube.accounting.datamodel.validations.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.gcube.accounting.datamodel.decorators.FieldDecorator;
+import org.gcube.accounting.datamodel.validations.validators.ValidURIValidator;
+
+@Target(ElementType.FIELD)
+@Retention(RetentionPolicy.RUNTIME)
+@FieldDecorator(managed=ValidURIValidator.class) 
+public @interface ValidURI {
+
+}
diff --git a/src/main/java/org/gcube/accounting/datamodel/validations/validators/ValidURIValidator.java b/src/main/java/org/gcube/accounting/datamodel/validations/validators/ValidURIValidator.java
new file mode 100644
index 0000000..b23c7a6
--- /dev/null
+++ b/src/main/java/org/gcube/accounting/datamodel/validations/validators/ValidURIValidator.java
@@ -0,0 +1,32 @@
+package org.gcube.accounting.datamodel.validations.validators;
+
+import java.io.Serializable;
+import java.net.URI;
+
+import org.gcube.accounting.datamodel.UsageRecord;
+import org.gcube.accounting.datamodel.decorators.FieldAction;
+import org.gcube.accounting.exception.InvalidValueException;
+
+public class ValidURIValidator implements FieldAction {
+	
+	private static final String ERROR = "Not Valid URI";
+	
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public Serializable validate(String key, Serializable value, UsageRecord usageRecord) throws InvalidValueException {
+		try {
+			if(value instanceof URI){
+				return value;
+			}
+			if(value instanceof String){
+				return new URI((String) value);
+			}
+		}catch (Exception e) {
+			throw new InvalidValueException(ERROR, e.getCause());
+		}
+		throw new InvalidValueException(ERROR);
+	}
+
+}