diff --git a/src/main/java/org/olat/user/restapi/IdentityToIdentityRelationVO.java b/src/main/java/org/olat/user/restapi/IdentityToIdentityRelationVO.java
index ec3b422b408e7e3e5032b981706e6abf5986ff73..27d0db0e48f60158f5facd8f4044b599528be85e 100644
--- a/src/main/java/org/olat/user/restapi/IdentityToIdentityRelationVO.java
+++ b/src/main/java/org/olat/user/restapi/IdentityToIdentityRelationVO.java
@@ -53,6 +53,7 @@ public class IdentityToIdentityRelationVO {
 	public static IdentityToIdentityRelationVO valueOf(IdentityToIdentityRelation relation) {
 		IdentityToIdentityRelationVO relationVo = new IdentityToIdentityRelationVO();
 		relationVo.setKey(relation.getKey());
+		relationVo.setExternalId(relation.getExternalId());
 		relationVo.setIdentitySourceKey(relation.getSource().getKey());
 		relationVo.setIdentityTargetKey(relation.getTarget().getKey());
 		relationVo.setExternalId(relation.getExternalId());