diff --git a/openapi.json b/openapi.json
index 4192c60..f4c4d52 100644
--- a/openapi.json
+++ b/openapi.json
@@ -13595,6 +13595,7 @@
           },
           "parentId": {
             "description": "Parent model object ID, null for the root level model object",
+            "minLength": 1,
             "nullable": true,
             "type": "string"
           },
@@ -13752,6 +13753,7 @@
           },
           "parentId": {
             "description": "Parent model object ID, null for the root level model object",
+            "minLength": 1,
             "nullable": true,
             "type": "string"
           },
@@ -13858,6 +13860,7 @@
           },
           "parentId": {
             "description": "Parent model object ID, null for the root level model object",
+            "minLength": 1,
             "nullable": true,
             "type": "string"
           },