diff --git a/core/config.class.inc.php b/core/config.class.inc.php
index 914fd9c9f8..864e76010b 100644
--- a/core/config.class.inc.php
+++ b/core/config.class.inc.php
@@ -519,6 +519,15 @@ class Config
 			'source_of_value' => '',
 			'show_in_conf_sample' => true,
 		),
+		'synchro_prevent_delete_all' => array(
+			'type' => 'bool',
+			'description' => 'Stop the synchro if all the replicas of a data source become obsolete at the same time.',
+			// examples... not used
+			'default' => true,
+			'value' => true,
+			'source_of_value' => '',
+			'show_in_conf_sample' => false,
+		),
 	);
 
 	public function IsProperty($sPropCode)
diff --git a/synchro/synchrodatasource.class.inc.php b/synchro/synchrodatasource.class.inc.php
index 00d7c70279..302b2095f3 100644
--- a/synchro/synchrodatasource.class.inc.php
+++ b/synchro/synchrodatasource.class.inc.php
@@ -2571,7 +2571,7 @@ class SynchroExecution
 			$sSelectToObsolete  = "SELECT SynchroReplica WHERE id > :curr_pos AND sync_source_id = :source_id AND status IN ('new', 'synchronized', 'modified', 'orphan') AND status_last_seen < :last_import";
 			$oSetScope = new DBObjectSet(DBObjectSearch::FromOQL($sSelectToObsolete), array() /* order by*/, array('source_id' => $this->m_oDataSource->GetKey(), 'last_import' => $sLimitDate, 'curr_pos' => $iCurrPos));
 			$iCountScope = $oSetScope->Count();
-			if (($this->m_iCountAllReplicas > 10) && ($this->m_iCountAllReplicas == $iCountScope))
+			if (($this->m_iCountAllReplicas > 10) && ($this->m_iCountAllReplicas == $iCountScope) && MetaModel::GetConfig()->Get('synchro_prevent_delete_all'))
 			{
 				throw new SynchroExceptionNotStarted(Dict::S('Core:SyncTooManyMissingReplicas'));
 			}