tree data UPDATE forbid unlinking list keys
diff --git a/src/tree_data_internal.h b/src/tree_data_internal.h
index 6d86f88..cfb93f1 100644
--- a/src/tree_data_internal.h
+++ b/src/tree_data_internal.h
@@ -398,6 +398,13 @@
void lyd_insert_node(struct lyd_node *parent, struct lyd_node **first_sibling, struct lyd_node *node, ly_bool last);
/**
+ * @brief Unlink the specified data subtree.
+ *
+ * @param[in] node Data tree node to be unlinked (together with all the children).
+ */
+void lyd_unlink(struct lyd_node *node);
+
+/**
* @brief Insert a metadata (last) into a parent
*
* @param[in] parent Parent of the metadata.