diff --git a/procedures/query/applyBackReference.sql b/procedures/query/applyBackReference.sql
index f287408e98c053c1c73c2f1808199320565c131f..9a2450750b42963fcff5de1e02e0054097ecc7fa 100644
--- a/procedures/query/applyBackReference.sql
+++ b/procedures/query/applyBackReference.sql
@@ -38,7 +38,7 @@ BEGIN
 		EXECUTE createBackRefSubQueryTable;
 		DEALLOCATE PREPARE createBackRefSubQueryTable;
 
-		SET @backRefSubResultSetStmtStr = CONCAT('INSERT INTO `',newTableName,'` (id,entity_id) SELECT entity_id AS id, value AS entity_id FROM `reference_data` AS data WHERE EXISTS (SELECT 1 FROM `',sourceSet,'` AS source WHERE source.id=data.value LIMIT 1)', IF(propertiesTable IS NULL,'',CONCAT(' AND EXISTS (SELECT 1 FROM `',propertiesTable,'` AS p WHERE p.id=data.property_id LIMIT 1)')), IF(entitiesTable IS NULL,'',CONCAT(' AND EXISTS (SELECT 1 FROM `',entitiesTable,'` AS e WHERE e.id=data.entity_id LIMIT 1)')));
+		SET @backRefSubResultSetStmtStr = CONCAT('INSERT IGNORE INTO `',newTableName,'` (id,entity_id) SELECT entity_id AS id, value AS entity_id FROM `reference_data` AS data WHERE EXISTS (SELECT 1 FROM `',sourceSet,'` AS source WHERE source.id=data.value LIMIT 1)', IF(propertiesTable IS NULL,'',CONCAT(' AND EXISTS (SELECT 1 FROM `',propertiesTable,'` AS p WHERE p.id=data.property_id LIMIT 1)')), IF(entitiesTable IS NULL,'',CONCAT(' AND EXISTS (SELECT 1 FROM `',entitiesTable,'` AS e WHERE e.id=data.entity_id LIMIT 1)')));
 
 		PREPARE backRefSubResultSetStmt FROM @backRefSubResultSetStmtStr;
 		EXECUTE backRefSubResultSetStmt;