diff --git a/sdmx30-infomodel/src/main/java/com/epam/jsdmx/infomodel/sdmx30/IdentifiableArtefactReferenceImpl.java b/sdmx30-infomodel/src/main/java/com/epam/jsdmx/infomodel/sdmx30/IdentifiableArtefactReferenceImpl.java
index 8968f03..5a05d55 100644
--- a/sdmx30-infomodel/src/main/java/com/epam/jsdmx/infomodel/sdmx30/IdentifiableArtefactReferenceImpl.java
+++ b/sdmx30-infomodel/src/main/java/com/epam/jsdmx/infomodel/sdmx30/IdentifiableArtefactReferenceImpl.java
@@ -121,6 +121,7 @@ public IdentifiableArtefactReferenceImpl clone() {
 
     @Override
     public String toString() {
-        return super.toString();
+        String superString = super.toString();
+        return superString + "." + itemId;
     }
 }
diff --git a/sdmx30-infomodel/src/test/java/com/epam/jsdmx/infomodel/sdmx30/IdentifiableArtefactReferenceImplTest.java b/sdmx30-infomodel/src/test/java/com/epam/jsdmx/infomodel/sdmx30/IdentifiableArtefactReferenceImplTest.java
new file mode 100644
index 0000000..5bd9e2d
--- /dev/null
+++ b/sdmx30-infomodel/src/test/java/com/epam/jsdmx/infomodel/sdmx30/IdentifiableArtefactReferenceImplTest.java
@@ -0,0 +1,20 @@
+package com.epam.jsdmx.infomodel.sdmx30;
+
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+class IdentifiableArtefactReferenceImplTest {
+    @Test
+    void testToString_happy() {
+        var subject = new IdentifiableArtefactReferenceImpl("id", "organisation", "1.0.0", StructureClassImpl.CONCEPT, "itemId");
+
+        Assertions.assertThat(subject.toString()).isEqualTo("Concept=organisation:id(1.0.0).itemId");
+    }
+
+    @Test
+    void testToString_itemIdIsNull() {
+        var subject = new IdentifiableArtefactReferenceImpl("id", "organisation", "1.0.0", StructureClassImpl.CONCEPT, null);
+
+        Assertions.assertThat(subject.toString()).isEqualTo("Concept=organisation:id(1.0.0).null");
+    }
+}
\ No newline at end of file