diff --git a/core/dbobject.class.php b/core/dbobject.class.php
index 8bb13c0fb..8e5dcbe6b 100644
--- a/core/dbobject.class.php
+++ b/core/dbobject.class.php
@@ -2704,15 +2704,19 @@ abstract class DBObject implements iDisplay
 				continue;
 			}
 
-			/** @noinspection NotOptimalIfConditionsInspection */
-			/** @noinspection TypeUnsafeComparisonInspection */
 			if (utils::IsNullOrEmptyString($sRemoteObjectClass)
 				|| utils::IsNullOrEmptyString($sRemoteObjectKey)
-				|| ($sRemoteObjectKey == 0) // non-strict comparison as we might have bad surprises
 			) {
 				continue;
 			}
 
+			// 0 : Undefined ext. key (EG. non-mandatory and no value provided)
+			// < 0 : Non yet persisted object
+            /** @noinspection TypeUnsafeComparisonInspection Non-strict comparison as object ID can be string */
+			if ($sRemoteObjectKey <= 0) {
+				continue;
+			}
+
 			if (false === $oIsObjectLoadableCallback($sRemoteObjectClass, $sRemoteObjectKey)) {
 				throw new InvalidExternalKeyValueException($this, $sAttDefCode);
 			}
diff --git a/datamodels/2.x/itop-portal-base/portal/src/Form/ObjectFormManager.php b/datamodels/2.x/itop-portal-base/portal/src/Form/ObjectFormManager.php
index 187eb8694..db276ef44 100644
--- a/datamodels/2.x/itop-portal-base/portal/src/Form/ObjectFormManager.php
+++ b/datamodels/2.x/itop-portal-base/portal/src/Form/ObjectFormManager.php
@@ -1153,6 +1153,9 @@ class ObjectFormManager extends FormManager
 			} catch (CoreCannotSaveObjectException $e) {
 				throw new Exception($e->getHtmlMessage());
 			} catch (InvalidExternalKeyValueException $e) {
+				ExceptionLog::LogException($e, $e->getContextData());
+				$bExceptionLogged = true;
+
 				throw new Exception($e->getIssue());
 			} catch (Exception $e) {
 				$aContext = [
diff --git a/tests/php-unit-tests/unitary-tests/core/DBObjectTest.php b/tests/php-unit-tests/unitary-tests/core/DBObjectTest.php
index 69ddebea8..5545c5cef 100644
--- a/tests/php-unit-tests/unitary-tests/core/DBObjectTest.php
+++ b/tests/php-unit-tests/unitary-tests/core/DBObjectTest.php
@@ -558,6 +558,7 @@ class DBObjectTest extends ItopDataTestCase
 		$oPersonLinks = \DBObjectSet::FromScratch(lnkPersonToTeam::class);
 		$oPersonLinks->AddObject(MetaModel::NewObject(lnkPersonToTeam::class, [
 			'person_id' => self::INVALID_OBJECT_KEY,
+			'team_id' => $oTeam->GetKey(),
 		]));
 		$oTeam->Set('persons_list', $oPersonLinks);
 
@@ -582,6 +583,7 @@ class DBObjectTest extends ItopDataTestCase
 		$oPersonLinks = \DBObjectSet::FromScratch(lnkPersonToTeam::class);
 		$oPersonLinks->AddObject(MetaModel::NewObject(lnkPersonToTeam::class, [
 			'person_id' => $oPersonOnDemoOrg->GetKey(),
+			'team_id' => $oTeam->GetKey(),
 		]));
 		$oTeam->Set('persons_list', $oPersonLinks);
 
@@ -603,6 +605,7 @@ class DBObjectTest extends ItopDataTestCase
 		$oPersonLinks = \DBObjectSet::FromScratch(lnkPersonToTeam::class);
 		$oPersonLinks->AddObject(MetaModel::NewObject(lnkPersonToTeam::class, [
 			'person_id' => $oPersonOnItDepartmentOrg->GetKey(),
+			'team_id' => $oTeam->GetKey(),
 		]));
 		$oTeam->Set('persons_list', $oPersonLinks);