diff -u b/src/Tests/EntityReferenceRevisionsCompositeTest.php b/src/Tests/EntityReferenceRevisionsCompositeTest.php
--- b/src/Tests/EntityReferenceRevisionsCompositeTest.php
+++ b/src/Tests/EntityReferenceRevisionsCompositeTest.php
@@ -66,7 +66,7 @@
       'bundle' => 'article',
     ]);
     $field->save();
-
+    // Add reference values to field config that will be used as default value.
     $default_value = [
       [
         'target_id' => $composite->id(),
@@ -93,11 +93,15 @@
     $node->delete();
     $this->assertNull(EntityTestCompositeRelationship::load($composite->id()));
 
+    // Check if the ERR default values are properly created.
+    $default_reference = $field->getDefaultValue($node);
+    $this->assertEqual($default_reference[0]['target_id'], $composite->id());
+    $this->assertEqual($default_reference[0]['revision_id'], $composite->getRevisionId());
     // Check if the configuration dependencies are properly created.
     $dependencies = $field->calculateDependencies()->getDependencies();
-    $this->assertEqual('field.storage.node.composite_reference', $dependencies['config'][0]);
-    $this->assertEqual('node.type.article', $dependencies['config'][1]);
-    $this->assertEqual('entity_reference_revisions', $dependencies['module'][0]);
+    $this->assertEqual($dependencies['config'][0], 'field.storage.node.composite_reference');
+    $this->assertEqual($dependencies['config'][1], 'node.type.article');
+    $this->assertEqual($dependencies['module'][0], 'entity_reference_revisions');
   }
 
 }
only in patch2:
unchanged:
--- a/config/schema/entity_reference_revisions.schema.yml
+++ b/config/schema/entity_reference_revisions.schema.yml
@@ -40,6 +40,17 @@ entity_reference_revisions.default.handler_settings:
 field.storage_settings.entity_reference_revisions:
   type: field.storage_settings.entity_reference
 
+field.value.entity_reference_revisions:
+  type: field.value.entity_reference
+  label: 'Default value'
+  mapping:
+    target_id:
+      type: integer
+      label: 'Value'
+    revision_id:
+      type: integer
+      label: 'Revision ID'
+
 field.field_settings.entity_reference_revisions:
   type: field.field_settings.entity_reference
 
only in patch2:
unchanged:
--- a/src/Plugin/Field/FieldType/EntityReferenceRevisionsItem.php
+++ b/src/Plugin/Field/FieldType/EntityReferenceRevisionsItem.php
@@ -23,6 +23,8 @@ use Drupal\entity_reference_revisions\EntityNeedsSaveInterface;
  * - target_bundle: (optional): If set, restricts the entity bundles which may
  *   may be referenced. May be set to an single bundle, or to an array of
  *   allowed bundles.
+ * - target_id: The entity ID to reference to, used as default value.
+ * - revision_id: The revision ID.
  *
  * @FieldType(
  *   id = "entity_reference_revisions",