diff --git a/taiga/export_import/serializers.py b/taiga/export_import/serializers.py
index e3996e59..0af1ae52 100644
--- a/taiga/export_import/serializers.py
+++ b/taiga/export_import/serializers.py
@@ -363,6 +363,9 @@ class BaseCustomAttributesValuesExportSerializer(serializers.ModelSerializer):
     _custom_attribute_model = None
     _container_field = None
 
+    class Meta:
+        exclude = ("id",)
+
     def validate_attributes_values(self, attrs, source):
         # values must be a dict
         data_values = attrs.get("attributes_values", None)
@@ -394,27 +397,24 @@ class UserStoryCustomAttributesValuesExportSerializer(BaseCustomAttributesValues
     _container_model = "userstories.UserStory"
     _container_field = "user_story"
 
-    class Meta:
+    class Meta(BaseCustomAttributesValuesExportSerializer.Meta):
         model = custom_attributes_models.UserStoryCustomAttributesValues
-        exclude = ("id",)
 
 
 class TaskCustomAttributesValuesExportSerializer(BaseCustomAttributesValuesExportSerializer):
     _custom_attribute_model = custom_attributes_models.TaskCustomAttribute
     _container_field = "task"
 
-    class Meta:
+    class Meta(BaseCustomAttributesValuesExportSerializer.Meta):
         model = custom_attributes_models.TaskCustomAttributesValues
-        exclude = ("id",)
 
 
 class IssueCustomAttributesValuesExportSerializer(BaseCustomAttributesValuesExportSerializer):
     _custom_attribute_model = custom_attributes_models.IssueCustomAttribute
     _container_field = "issue"
 
-    class Meta:
+    class Meta(BaseCustomAttributesValuesExportSerializer.Meta):
         model = custom_attributes_models.IssueCustomAttributesValues
-        exclude = ("id",)
 
 
 class MembershipExportSerializer(serializers.ModelSerializer):
diff --git a/taiga/projects/custom_attributes/serializers.py b/taiga/projects/custom_attributes/serializers.py
index 06f46ec2..0a7d4a65 100644
--- a/taiga/projects/custom_attributes/serializers.py
+++ b/taiga/projects/custom_attributes/serializers.py
@@ -80,6 +80,9 @@ class BaseCustomAttributesValuesSerializer(ModelSerializer):
     _custom_attribute_model = None
     _container_field = None
 
+    class Meta:
+        exclude = ("id",)
+
     def validate_attributes_values(self, attrs, source):
         # values must be a dict
         data_values = attrs.get("attributes_values", None)
@@ -112,7 +115,7 @@ class UserStoryCustomAttributesValuesSerializer(BaseCustomAttributesValuesSerial
     _container_model = "userstories.UserStory"
     _container_field = "user_story"
 
-    class Meta:
+    class Meta(BaseCustomAttributesValuesSerializer.Meta):
         model = models.UserStoryCustomAttributesValues
 
 
@@ -120,7 +123,7 @@ class TaskCustomAttributesValuesSerializer(BaseCustomAttributesValuesSerializer,
     _custom_attribute_model = models.TaskCustomAttribute
     _container_field = "task"
 
-    class Meta:
+    class Meta(BaseCustomAttributesValuesSerializer.Meta):
         model = models.TaskCustomAttributesValues
 
 
@@ -128,5 +131,5 @@ class IssueCustomAttributesValuesSerializer(BaseCustomAttributesValuesSerializer
     _custom_attribute_model = models.IssueCustomAttribute
     _container_field = "issue"
 
-    class Meta:
+    class Meta(BaseCustomAttributesValuesSerializer.Meta):
         model = models.IssueCustomAttributesValues