diff --git a/core/attributedef.class.inc.php b/core/attributedef.class.inc.php
index 8751a0d042..82c9f6cba2 100644
--- a/core/attributedef.class.inc.php
+++ b/core/attributedef.class.inc.php
@@ -7987,6 +7987,17 @@ class AttributeExternalField extends AttributeDefinition
 		return $oExtAttDef->MakeRealValue($proposedValue, $oHostObj);
 	}
 
+	/**
+	 * @inheritDoc
+	 * @since 3.1.0 N°6271 Delegate to remote attribute to ensure cascading computed values
+	 */
+	public function GetSQLValues($value)
+	{
+		$oExtAttDef = $this->GetExtAttDef();
+
+		return $oExtAttDef->GetSQLValues($value);
+	}
+
 	public function ScalarToSQL($value)
 	{
 		// This one could be used in case of filtering only
diff --git a/core/dbobject.class.php b/core/dbobject.class.php
index 62603de165..9d9dda78e1 100644
--- a/core/dbobject.class.php
+++ b/core/dbobject.class.php
@@ -2853,11 +2853,10 @@ abstract class DBObject implements iDisplay
 
 		$aHierarchicalKeys = array();
 		
-		foreach(MetaModel::ListAttributeDefs($sTableClass) as $sAttCode=>$oAttDef)
-		{
+		foreach(MetaModel::ListAttributeDefs($sTableClass) as $sAttCode=>$oAttDef) {
 			// Skip this attribute if not defined in this table
-			if (!MetaModel::IsAttributeOrigin($sTableClass, $sAttCode) && !$oAttDef->CopyOnAllTables())
-			{
+			if ((!MetaModel::IsAttributeOrigin($sTableClass, $sAttCode) && !$oAttDef->CopyOnAllTables())
+				|| $oAttDef->IsExternalField()) {
 				continue;
 			}
 			$aAttColumns = $oAttDef->GetSQLValues($this->m_aCurrValues[$sAttCode]);
@@ -2981,10 +2980,13 @@ abstract class DBObject implements iDisplay
 		}
 
 		$aHierarchicalKeys = array();
-		foreach(MetaModel::ListAttributeDefs($sTableClass) as $sAttCode=>$oAttDef)
+		foreach(MetaModel::ListAttributeDefs($sTableClass) as $sAttCode => $oAttDef)
 		{
 			// Skip this attribute if not defined in this table
-			if (!MetaModel::IsAttributeOrigin($sTableClass, $sAttCode)) continue;
+			if ((!MetaModel::IsAttributeOrigin($sTableClass, $sAttCode))
+				|| $oAttDef->IsExternalField()) {
+				continue;
+			};
 			// Skip link set that can still be undefined though the object is 100% loaded
 			if ($oAttDef->IsLinkSet()) continue;
 
@@ -6011,11 +6013,8 @@ abstract class DBObject implements iDisplay
 			}
 
 			$oAttDef = MetaModel::GetAttributeDef(get_class($this), $sAttCode);
-			$aSQLValues = $oAttDef->GetSQLValues($this->m_aCurrValues[$sAttCode]);
+			$aSQLValues = $oAttDef->GetSQLValues($this->Get($sAttCode));
 			$value = reset($aSQLValues);
-			if ($oAttDef->IsNull($value)) {
-				return '';
-			}
 			$aArgs[$sFieldDesc] = $value;
 		}
 
diff --git a/core/oql/expression.class.inc.php b/core/oql/expression.class.inc.php
index 78a9636ddd..0a6db899e9 100644
--- a/core/oql/expression.class.inc.php
+++ b/core/oql/expression.class.inc.php
@@ -3526,6 +3526,7 @@ class CharConcatWSExpression extends CharConcatExpression
 		$aRes = array();
 		foreach ($this->m_aExpressions as $oExpr)
 		{
+			// TODO: Seems weird, this should rather be $aRes[] = $oExpr->Evaluate($aArgs);
 			$aRes .= $oExpr->Evaluate($aArgs);
 		}
 		return implode($this->m_separator, $aRes);
diff --git a/core/sqlobjectquerybuilder.class.inc.php b/core/sqlobjectquerybuilder.class.inc.php
index 4b1ea37792..568e4b3435 100644
--- a/core/sqlobjectquerybuilder.class.inc.php
+++ b/core/sqlobjectquerybuilder.class.inc.php
@@ -218,8 +218,8 @@ class SQLObjectQueryBuilder
 					continue;
 				}
 				$oAttDef = MetaModel::GetAttributeDef($sClass, $sAttCode);
-				// Skip this attribute if not made of SQL columns
-				if (count($oAttDef->GetSQLExpressions()) == 0)
+				// Skip this attribute if not made of SQL columns nor in current table
+				if (count($oAttDef->GetSQLExpressions()) == 0 || $oAttDef->IsExternalField())
 				{
 					continue;
 				}
diff --git a/tests/php-unit-tests/unitary-tests/core/DBObjectTest.php b/tests/php-unit-tests/unitary-tests/core/DBObjectTest.php
index b19ec8acb9..23e9bd592d 100644
--- a/tests/php-unit-tests/unitary-tests/core/DBObjectTest.php
+++ b/tests/php-unit-tests/unitary-tests/core/DBObjectTest.php
@@ -140,7 +140,7 @@ class DBObjectTest extends ItopDataTestCase
 	 * @covers DBObject::Get
 	 * @covers DBObject::Set
 	 */
-	public function testAttributeRefresh_FriendlyName()
+	public function testAttributeRefresh_FriendlyNameWithoutCascade()
 	{
 		$oObject = \MetaModel::NewObject('Person', array('name' => 'Foo', 'first_name' => 'John', 'org_id' => 3, 'location_id' => 2));
 
@@ -149,6 +149,21 @@ class DBObjectTest extends ItopDataTestCase
 		static::assertEquals('John Who', $oObject->Get('friendlyname'));
 	}
 
+	/**
+	 * @covers DBObject::NewObject
+	 * @covers DBObject::Get
+	 * @covers DBObject::Set
+	 */
+	public function testAttributeRefresh_FriendlyNameWithCascade()
+	{
+		$oServer = \MetaModel::NewObject('Server', ['name' => 'ServerTest', 'org_id' => 3]);
+		$oServer->DBInsert();
+		$oDBServer = \MetaModel::NewObject('DBServer', ['name' => 'DBServerTest', 'org_id' => 3, 'system_id' => $oServer]);
+
+		static::assertEquals('ServerTest', $oDBServer->Get('system_name'));
+		static::assertEquals('DBServerTest ServerTest', $oDBServer->Get('friendlyname'));
+	}
+
 	/**
 	 * @covers MetaModel::GetObject
 	 * @covers DBObject::Get
@@ -174,8 +189,7 @@ class DBObjectTest extends ItopDataTestCase
 	public function testPartialAttributeEvaluation()
 	{
 		$oObject = \MetaModel::NewObject('Person', array('name' => 'Foo', 'org_id' => 3, 'location_id' => 2));
-
-		static::assertEquals('', $oObject->Get('friendlyname'));
+		static::assertEquals(' Foo', $oObject->Get('friendlyname'));
 	}
 
 	/**
@@ -186,7 +200,7 @@ class DBObjectTest extends ItopDataTestCase
 	{
 		$oObject = \MetaModel::NewObject('Person', array('org_id' => 3, 'location_id' => 2));
 
-		static::assertEquals('', $oObject->Get('friendlyname'));
+		static::assertEquals(' ', $oObject->Get('friendlyname'));
 	}
 
 	/**
@@ -198,7 +212,7 @@ class DBObjectTest extends ItopDataTestCase
 		$oUserProfile = new \URP_UserProfile();
 		$oUserProfile->Set('profileid', 2);
 
-		static::assertEquals('', $oUserProfile->Get('friendlyname'));
+		static::assertEquals('Link between  and Portal user', $oUserProfile->Get('friendlyname'));
 	}
 
 	/**
@@ -206,7 +220,7 @@ class DBObjectTest extends ItopDataTestCase
 	 * @covers DBObject::Get
 	 * @covers DBObject::Set
 	 */
-	public function testAttributeRefresh_ObsolescenceFlag()
+	public function testAttributeRefresh_ObsolescenceFlagWithoutCascade()
 	{
 		$oObject = \MetaModel::NewObject('Person', array('name' => 'Foo', 'first_name' => 'John', 'org_id' => 3, 'location_id' => 2));
 
@@ -215,6 +229,24 @@ class DBObjectTest extends ItopDataTestCase
 		static::assertEquals(true, (bool)$oObject->Get('obsolescence_flag'));
 	}
 
+	/**
+	 * @covers DBObject::NewObject
+	 * @covers DBObject::Get
+	 * @covers DBObject::Set
+	 */
+	public function testAttributeRefresh_ObsolescenceFlagWithCascade()
+	{
+		$this->markTestSkipped('Postponed');
+		// Necessary ext. key for $oDBServer
+		$oServer = \MetaModel::NewObject('Server', ['name' => 'ServerTest', 'org_id' => 3]);
+		$oServer->DBInsert();
+		$oDBServer = \MetaModel::NewObject('DBServer', ['name' => 'DBServerTest', 'org_id' => 3, 'system_id' => $oServer, 'status' => 'inactive']);
+		$oDBServer->DBInsert();
+
+		$oDBSchema = \MetaModel::NewObject('DatabaseSchema', ['name' => 'DBSchemaTest', 'org_id' => 3, 'dbserver_id' => $oDBServer]);
+		static::assertEquals(true, $oDBSchema->Get('obsolescence_flag'));
+	}
+
 	/**
 	 * @covers DBObject::NewObject
 	 * @covers DBObject::Get