diff --git a/src/main/java/org/gcube/accounting/analytics/persistence/postgresql/AccountingPersistenceQueryPostgreSQL.java b/src/main/java/org/gcube/accounting/analytics/persistence/postgresql/AccountingPersistenceQueryPostgreSQL.java
index 4a1395f..74b9c5d 100644
--- a/src/main/java/org/gcube/accounting/analytics/persistence/postgresql/AccountingPersistenceQueryPostgreSQL.java
+++ b/src/main/java/org/gcube/accounting/analytics/persistence/postgresql/AccountingPersistenceQueryPostgreSQL.java
@@ -84,9 +84,10 @@ public class AccountingPersistenceQueryPostgreSQL implements AccountingPersisten
 		this.contexts = contexts;
 	}
 	
+	@SuppressWarnings("unchecked")
 	@Override
-	public void setFilters(Collection<Filter> filters) {
-		this.filters = filters;
+	public void setFilters(Collection<? extends Filter> filters) {
+		this.filters = (Collection<Filter>) filters;
 	}
 	
 	static {
diff --git a/src/main/java/org/gcube/accounting/analytics/persistence/postgresql/Query.java b/src/main/java/org/gcube/accounting/analytics/persistence/postgresql/Query.java
index 8955213..7d04eb7 100644
--- a/src/main/java/org/gcube/accounting/analytics/persistence/postgresql/Query.java
+++ b/src/main/java/org/gcube/accounting/analytics/persistence/postgresql/Query.java
@@ -56,7 +56,7 @@ public class Query extends PostgreSQLQuery {
 		this.temporalConstraint = temporalConstraint;
 	}
 
-	public void setFilters(Collection<Filter> filters) {
+	public void setFilters(Collection<? extends Filter> filters) {
 		this.filters = new HashMap<>();
 		if(filters!=null && filters.size()>0) {
 			for(Filter filter : filters) {
diff --git a/src/test/java/org/gcube/accounting/analytics/persistence/postgresql/AccountingPersistenceQueryPostgreSQLTest.java b/src/test/java/org/gcube/accounting/analytics/persistence/postgresql/AccountingPersistenceQueryPostgreSQLTest.java
index 3841c0b..a29c40f 100644
--- a/src/test/java/org/gcube/accounting/analytics/persistence/postgresql/AccountingPersistenceQueryPostgreSQLTest.java
+++ b/src/test/java/org/gcube/accounting/analytics/persistence/postgresql/AccountingPersistenceQueryPostgreSQLTest.java
@@ -5,6 +5,7 @@ package org.gcube.accounting.analytics.persistence.postgresql;
 
 import java.util.ArrayList;
 import java.util.Calendar;
+import java.util.Collection;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
@@ -26,6 +27,7 @@ import org.gcube.accounting.analytics.persistence.AccountingPersistenceQuery;
 import org.gcube.accounting.datamodel.UsageRecord;
 import org.gcube.accounting.datamodel.aggregation.AggregatedJobUsageRecord;
 import org.gcube.accounting.datamodel.aggregation.AggregatedServiceUsageRecord;
+import org.gcube.accounting.datamodel.aggregation.AggregatedStorageStatusRecord;
 import org.gcube.accounting.datamodel.aggregation.AggregatedStorageUsageRecord;
 import org.gcube.accounting.datamodel.basetypes.AbstractStorageUsageRecord.DataType;
 import org.gcube.accounting.utility.postgresql.RecordToDBMapping;
@@ -218,6 +220,14 @@ public class AccountingPersistenceQueryPostgreSQLTest extends ContextTest {
 		}
 	}
 	
+	@Test
+	public void gcTest() throws Exception {
+		accountingPersistenceQueryPostgreSQL.setRequestedRecords(AggregatedStorageStatusRecord.class);
+		Collection<NumberedFilter> myFilters = accountingPersistenceQueryPostgreSQL.getFilterValues(AggregatedStorageStatusRecord.DATA_TYPE);
+		accountingPersistenceQueryPostgreSQL.setFilters(myFilters);
+		accountingPersistenceQueryPostgreSQL.getTimeSeries();
+	}
+	
 	@Test
 	public void testTopValues() throws DuplicatedKeyFilterException, KeyException, ValueException, Exception {	
 		String orderingProperty = AccountingPersistenceQuery.getDefaultOrderingProperties(AggregatedServiceUsageRecord.class);