diff --git a/app/Services/ClusterCompetitiveness.php b/app/Services/ClusterCompetitiveness.php
index 521e80ba..44ac5916 100644
--- a/app/Services/ClusterCompetitiveness.php
+++ b/app/Services/ClusterCompetitiveness.php
@@ -57,6 +57,7 @@ final class ClusterCompetitiveness
             }
         }
         $clean = Validator::make($draft, $rules)->validate();
+        $clean['version'] = 1;
         $clean['sector'] = trim($clean['sector'] ?? '');
         $clean['region'] = trim($clean['region'] ?? '');
         foreach (self::FORCES as $force) {
diff --git a/tests/Feature/ClusterCompetitivenessTest.php b/tests/Feature/ClusterCompetitivenessTest.php
index 76e548d6..e7b30483 100644
--- a/tests/Feature/ClusterCompetitivenessTest.php
+++ b/tests/Feature/ClusterCompetitivenessTest.php
@@ -121,6 +121,19 @@ class ClusterCompetitivenessTest extends TestCase
         $this->getJson($this->url($cluster))->assertJsonPath('version', 1)->assertJsonPath('draft.forces.buyers.source', '');
     }
 
+    public function test_saved_data_keeps_the_portable_file_contract_and_rejects_missing_forces(): void
+    {
+        $this->manager();
+        $cluster = $this->cluster();
+        $draft = $this->draft($cluster);
+        $draft['version'] = '1';
+        $this->postJson($this->url($cluster).'/saved', ['expected_version' => 0, 'draft' => $draft])
+            ->assertOk()->assertJsonPath('draft.version', 1);
+        unset($draft['forces']['suppliers']);
+        $this->postJson($this->url($cluster).'/saved', ['expected_version' => 1, 'draft' => $draft])->assertUnprocessable();
+        $this->getJson($this->url($cluster))->assertJsonPath('version', 1);
+    }
+
     public function test_anonymous_and_unauthorised_users_cannot_read_history_or_mutate(): void
     {
         $cluster = $this->cluster();