diff --git a/mmv1/products/appengine/FlexibleAppVersion.yaml b/mmv1/products/appengine/FlexibleAppVersion.yaml
index 176e6850c19b..7c49ae86f6a2 100644
--- a/mmv1/products/appengine/FlexibleAppVersion.yaml
+++ b/mmv1/products/appengine/FlexibleAppVersion.yaml
@@ -502,7 +502,7 @@ properties:
     name: 'deployment'
     description: |
       Code and application artifacts that make up this version.
-    custom_flatten: templates/terraform/custom_flatten/app_version.go.erb
+    ignore_read: true
     properties:
       - !ruby/object:Api::Type::NestedObject
         name: 'zip'
diff --git a/mmv1/templates/terraform/custom_flatten/app_version.go.erb b/mmv1/templates/terraform/custom_flatten/app_version.go.erb
deleted file mode 100644
index 745563b1382e..000000000000
--- a/mmv1/templates/terraform/custom_flatten/app_version.go.erb
+++ /dev/null
@@ -1,68 +0,0 @@
-<%# The license inside this block applies to this file.
-	# Copyright 2022 Google Inc.
-	# Licensed under the Apache License, Version 2.0 (the "License");
-	# you may not use this file except in compliance with the License.
-	# You may obtain a copy of the License at
-	#
-	#     http://www.apache.org/licenses/LICENSE-2.0
-	#
-	# Unless required by applicable law or agreed to in writing, software
-	# distributed under the License is distributed on an "AS IS" BASIS,
-	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-	# See the License for the specific language governing permissions and
-	# limitations under the License.
--%>
-func flatten<%= prefix -%><%= titlelize_property(property) -%>(v interface{}, d *schema.ResourceData, config *transport_tpg.Config) interface{} {
-	original := v.(map[string]interface{})
-	transformed := make(map[string]interface{})
-	transformed["zip"] = d.Get("deployment.0.zip")
-	transformed["files"] = d.Get("deployment.0.files")
-	transformed["container"] =
-		flattenAppEngineFlexibleAppVersionDeploymentContainer(original["container"], d, config)
-	transformed["cloud_build_options"] =
-		flattenAppEngineFlexibleAppVersionDeploymentCloudBuildOptions(original["cloudBuildOptions"], d, config)
-
-	return []interface{}{transformed}
-}
-
-func flattenAppEngineFlexibleAppVersionDeploymentContainer(v interface{}, d *schema.ResourceData, config *transport_tpg.Config) interface{} {
-	if v == nil {
-		return nil
-	}
-	original := v.(map[string]interface{})
-	if len(original) == 0 {
-		return nil
-	}
-	transformed := make(map[string]interface{})
-	transformed["image"] =
-		flattenAppEngineFlexibleAppVersionDeploymentContainerImage(original["image"], d, config)
-	return []interface{}{transformed}
-}
-
-func flattenAppEngineFlexibleAppVersionDeploymentContainerImage(v interface{}, d *schema.ResourceData, config *transport_tpg.Config) interface{} {
-	return v
-}
-
-func flattenAppEngineFlexibleAppVersionDeploymentCloudBuildOptions(v interface{}, d *schema.ResourceData, config *transport_tpg.Config) interface{} {
-	if v == nil {
-		return nil
-	}
-	original := v.(map[string]interface{})
-	if len(original) == 0 {
-		return nil
-	}
-	transformed := make(map[string]interface{})
-	transformed["app_yaml_path"] =
-		flattenAppEngineFlexibleAppVersionDeploymentCloudBuildOptionsAppYamlPath(original["appYamlPath"], d, config)
-	transformed["cloud_build_timeout"] =
-		flattenAppEngineFlexibleAppVersionDeploymentCloudBuildOptionsCloudBuildTimeout(original["cloudBuildTimeout"], d, config)
-	return []interface{}{transformed}
-}
-
-func flattenAppEngineFlexibleAppVersionDeploymentCloudBuildOptionsAppYamlPath(v interface{}, d *schema.ResourceData, config *transport_tpg.Config) interface{} {
-	return v
-}
-
-func flattenAppEngineFlexibleAppVersionDeploymentCloudBuildOptionsCloudBuildTimeout(v interface{}, d *schema.ResourceData, config *transport_tpg.Config) interface{} {
-	return v
-}
diff --git a/mmv1/third_party/terraform/services/appengine/resource_app_engine_flexible_app_version_test.go b/mmv1/third_party/terraform/services/appengine/resource_app_engine_flexible_app_version_test.go
index 14111114306f..f3aec88b7bdd 100644
--- a/mmv1/third_party/terraform/services/appengine/resource_app_engine_flexible_app_version_test.go
+++ b/mmv1/third_party/terraform/services/appengine/resource_app_engine_flexible_app_version_test.go
@@ -29,7 +29,7 @@ func TestAccAppEngineFlexibleAppVersion_update(t *testing.T) {
 				ResourceName:            "google_app_engine_flexible_app_version.foo",
 				ImportState:             true,
 				ImportStateVerify:       true,
-				ImportStateVerifyIgnore: []string{"env_variables", "deployment.0.files", "entrypoint", "service", "noop_on_destroy"},
+				ImportStateVerifyIgnore: []string{"env_variables", "deployment", "entrypoint", "service", "noop_on_destroy"},
 			},
 			{
 				Config: testAccAppEngineFlexibleAppVersion_pythonUpdate(context),
@@ -38,7 +38,7 @@ func TestAccAppEngineFlexibleAppVersion_update(t *testing.T) {
 				ResourceName:            "google_app_engine_flexible_app_version.foo",
 				ImportState:             true,
 				ImportStateVerify:       true,
-				ImportStateVerifyIgnore: []string{"env_variables", "deployment.0.files", "entrypoint", "service", "noop_on_destroy"},
+				ImportStateVerifyIgnore: []string{"env_variables", "deployment", "entrypoint", "service", "noop_on_destroy"},
 			},
 		},
 	})