diff --git a/static/api-specs/idn/v3/schemas/DtoType.yaml b/static/api-specs/idn/v3/schemas/DtoType.yaml
index 416bd18c2..d0f047dbe 100644
--- a/static/api-specs/idn/v3/schemas/DtoType.yaml
+++ b/static/api-specs/idn/v3/schemas/DtoType.yaml
@@ -21,6 +21,7 @@ enum:
   - RULE
   - SOD_POLICY
   - SOURCE
+  - TAG
   - TAG_CATEGORY
   - TASK_RESULT
   - REPORT_RESULT
diff --git a/static/api-specs/idn/v3/schemas/Expression.yaml b/static/api-specs/idn/v3/schemas/Expression.yaml
index b04630a4e..1bee49777 100644
--- a/static/api-specs/idn/v3/schemas/Expression.yaml
+++ b/static/api-specs/idn/v3/schemas/Expression.yaml
@@ -15,6 +15,7 @@ properties:
     $ref: './Value.yaml'
   children:
     type: array
+    nullable: true
     description: List of expressions
     items:
       $ref: './Value.yaml'
diff --git a/static/api-specs/idn/v3/schemas/access/OwnerReference.yaml b/static/api-specs/idn/v3/schemas/access/OwnerReference.yaml
index 11f05a545..bd1bb7455 100644
--- a/static/api-specs/idn/v3/schemas/access/OwnerReference.yaml
+++ b/static/api-specs/idn/v3/schemas/access/OwnerReference.yaml
@@ -1,4 +1,5 @@
 type: object
+nullable: true
 description: The owner of this object.
 properties:
   type: