diff --git a/lib/config/config.c b/lib/config/config.c
index 35ee3ac5b..eb8880ee3 100644
--- a/lib/config/config.c
+++ b/lib/config/config.c
@@ -1040,9 +1040,14 @@ static int _config_def_check_tree(struct cft_check_handle *handle,
 				  size_t buf_size, struct dm_config_node *root)
 {
 	struct dm_config_node *cn;
+	cfg_def_item_t *def;
 	int valid, r = 1;
 	size_t len;
 
+	def = cfg_def_get_item_p(root->id);
+	if (def->flags & CFG_SECTION_NO_CHECK)
+		return 1;
+
 	for (cn = root->child; cn; cn = cn->sib) {
 		if ((valid = _config_def_check_node(handle, vp, pvp, rp, prp,
 						    buf_size, cn)) && !cn->v) {
@@ -1662,14 +1667,9 @@ static int _out_prefix_fn(const struct dm_config_node *cn, const char *line, voi
 	char path[CFG_PATH_MAX_LEN];
 	char commentline[MAX_COMMENT_LINE+1];
 
-	if (cn->id < 0)
+	if (cn->id <= 0)
 		return 1;
 
-	if (!cn->id) {
-		log_error(INTERNAL_ERROR "Configuration node %s has invalid id.", cn->key);
-		return 0;
-	}
-
 	if (out->tree_spec->type == CFG_DEF_TREE_LIST)
 		return 1;
 
diff --git a/lib/config/config.h b/lib/config/config.h
index 03319bfcd..7520fc074 100644
--- a/lib/config/config.h
+++ b/lib/config/config.h
@@ -121,6 +121,8 @@ typedef union {
 #define CFG_DISABLED		0x200
 /* whether to print integers in octal form (prefixed by "0") */
 #define CFG_FORMAT_INT_OCTAL	0x400
+/* whether to disable checks for the whole config section subtree */
+#define CFG_SECTION_NO_CHECK	0x800
 
 /* configuration definition item structure */
 typedef struct cfg_def_item {
diff --git a/lib/config/config_settings.h b/lib/config/config_settings.h
index ce03b36be..520953148 100644
--- a/lib/config/config_settings.h
+++ b/lib/config/config_settings.h
@@ -51,6 +51,7 @@
  *                                 CFG_DEFAULT_COMMENTED - node's default value is commented out on output
  *                                 CFG_DISABLED - configuration is disabled (defaults always used)
  *                                 CFG_FORMAT_INT_OCTAL - print integer number in octal form (also prefixed by "0")
+ *                                 CFG_SECTION_NO_CHECK - do not check content of the section at all - use with care!!!
  *
  * type:		       Allowed type for the value of simple configuation setting, one of:
  *                                 CFG_TYPE_BOOL