diff --git a/mmv1/products/compute/ServiceAttachment.yaml b/mmv1/products/compute/ServiceAttachment.yaml
index 3e4254b37208..f0e27bee6dec 100644
--- a/mmv1/products/compute/ServiceAttachment.yaml
+++ b/mmv1/products/compute/ServiceAttachment.yaml
@@ -170,6 +170,7 @@ properties:
     required: true
     immutable: true
     diff_suppress_func: 'tpgresource.CompareSelfLinkOrResourceName'
+    custom_expand: 'templates/terraform/custom_expand/service_attachment_target_service.go.tmpl'
   - name: 'natSubnets'
     type: Array
     description: |
diff --git a/mmv1/templates/terraform/custom_expand/service_attachment_target_service.go.tmpl b/mmv1/templates/terraform/custom_expand/service_attachment_target_service.go.tmpl
new file mode 100644
index 000000000000..512d7fcf22bf
--- /dev/null
+++ b/mmv1/templates/terraform/custom_expand/service_attachment_target_service.go.tmpl
@@ -0,0 +1,15 @@
+func expand{{$.GetPrefix}}{{$.TitlelizeProperty}}(v interface{}, d tpgresource.TerraformResourceData, config *transport_tpg.Config) (interface{}, error) {
+	resource := strings.Split(v.(string), "/")
+    resourceKind := resource[len(resource)-2]
+    resourceBound := resource[len(resource)-4]
+    if len(resource) < 4 {
+		return nil, fmt.Errorf("invalid value for target_service")
+	}
+    
+    _, err := tpgresource.ParseRegionalFieldValue(resourceKind, v.(string), "project", resourceBound, "zone", d, config, true)
+	if err != nil {
+		return nil, fmt.Errorf("invalid value for target_service: %w", err)
+	}
+    
+    return v, nil
+}
diff --git a/mmv1/third_party/terraform/services/compute/resource_compute_service_attachment_test.go.tmpl b/mmv1/third_party/terraform/services/compute/resource_compute_service_attachment_test.go.tmpl
index a1d62492a635..ca1cbca38a37 100644
--- a/mmv1/third_party/terraform/services/compute/resource_compute_service_attachment_test.go.tmpl
+++ b/mmv1/third_party/terraform/services/compute/resource_compute_service_attachment_test.go.tmpl
@@ -414,7 +414,7 @@ resource "google_compute_service_attachment" "default" {
   enable_proxy_protocol    = false
   connection_preference    = "ACCEPT_AUTOMATIC"
   nat_subnets              = [google_compute_subnetwork.psc.id]
-  target_service           = google_network_services_gateway.foobar.self_link
+  target_service           = google_network_services_gateway.default.self_link
 }
 
 resource "google_certificate_manager_certificate" "default" {
@@ -473,14 +473,14 @@ resource "google_network_security_gateway_security_policy_rule" "default" {
   basic_profile           = "ALLOW"
 }
 
-resource "google_network_services_gateway" "foobar" {
+resource "google_network_services_gateway" "default" {
   name                                 = "tf-test-sa-swp-%{random_suffix}"
   location                             = "us-east1"
   addresses                            = ["10.128.0.99"]
   type                                 = "SECURE_WEB_GATEWAY"
   ports                                = [443]
   description                          = "my description"
-  scope                                = "%s"
+  scope                                = "serviceAttachment"
   certificate_urls                     = [google_certificate_manager_certificate.default.id]
   gateway_security_policy              = google_network_security_gateway_security_policy.default.id
   network                              = google_compute_network.default.id