diff --git a/tests/php-unit-tests/src/BaseTestCase/ItopCustomDatamodelTestCase.php b/tests/php-unit-tests/src/BaseTestCase/ItopCustomDatamodelTestCase.php
index 3f0c8ede6..84d4aac7e 100644
--- a/tests/php-unit-tests/src/BaseTestCase/ItopCustomDatamodelTestCase.php
+++ b/tests/php-unit-tests/src/BaseTestCase/ItopCustomDatamodelTestCase.php
@@ -189,6 +189,8 @@ abstract class ItopCustomDatamodelTestCase extends ItopDataTestCase
 			}
 			CMDBSource::CreateDB($oTestConfig->Get('db_name'));
 			MetaModel::Startup($sConfFile, false /* $bModelOnly */, true /* $bAllowCache */, false /* $bTraceSourceFiles */, $sTestEnv);
+            // N°7446 For some reason we need to create the DB schema before starting the MM, then only we can create the tables.
+            MetaModel::DBCreate();
 
 			$this->MarkEnvironmentReady();
 			$this->debug('Preparation of custom environment "'.$sTestEnv.'" done.');