--- /dev/null
+<?php
+
+namespace Drupal\entity_test\Entity;
+
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\Core\Field\BaseFieldDefinition;
+
+/**
+ * Defines the test entity class.
+ *
+ * @ContentEntityType(
+ * id = "entity_test_mul_default_value",
+ * label = @Translation("Test entity - data table"),
+ * handlers = {
+ * "view_builder" = "Drupal\entity_test\EntityTestViewBuilder",
+ * "access" = "Drupal\entity_test\EntityTestAccessControlHandler",
+ * "form" = {
+ * "default" = "Drupal\entity_test\EntityTestForm",
+ * "delete" = "Drupal\entity_test\EntityTestDeleteForm"
+ * },
+ * "translation" = "Drupal\content_translation\ContentTranslationHandler",
+ * "views_data" = "Drupal\views\EntityViewsData"
+ * },
+ * base_table = "entity_test_mul_default_value",
+ * data_table = "entity_test_mul_default_value_property_data",
+ * translatable = TRUE,
+ * entity_keys = {
+ * "id" = "id",
+ * "uuid" = "uuid",
+ * "bundle" = "type",
+ * "label" = "name",
+ * "langcode" = "langcode"
+ * },
+ * links = {
+ * "canonical" = "/entity_test_mul_default_value/manage/{entity_test_mul_default_value}",
+ * "edit-form" = "/entity_test_mul_default_value/manage/{entity_test_mul_default_value}",
+ * "delete-form" = "/entity_test/delete/entity_test_mul_default_value/{entity_test_mul_default_value}",
+ * },
+ * field_ui_base_route = "entity.entity_test_mul.admin_form",
+ * )
+ */
+class EntityTestMulDefaultValue extends EntityTestMul {
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
+ $fields = parent::baseFieldDefinitions($entity_type);
+
+ $fields['description'] = BaseFieldDefinition::create('shape')
+ ->setLabel(t('Some custom description'))
+ ->setTranslatable(TRUE)
+ ->setDefaultValueCallback('entity_test_field_default_value');
+
+ return $fields;
+ }
+
+}