diff --git a/app/Membership/Actions/MassStoreAction.php b/app/Membership/Actions/MassStoreAction.php
index b5824bc8..a943e5b6 100644
--- a/app/Membership/Actions/MassStoreAction.php
+++ b/app/Membership/Actions/MassStoreAction.php
@@ -10,6 +10,7 @@ use App\Maildispatcher\Actions\ResyncAction;
 use App\Member\Member;
 use App\Member\Membership;
 use App\Subactivity;
+use Illuminate\Http\JsonResponse;
 use Illuminate\Support\Facades\DB;
 use Lorisleiva\Actions\ActionRequest;
 use Lorisleiva\Actions\Concerns\AsAction;
@@ -26,7 +27,12 @@ class MassStoreAction
     {
         return [
             'group_id' => 'required|numeric|exists:groups,id',
-            'activity_id' => 'required|numeric|exists:activities,id',
+            'activity_id' => ['required', 'numeric', 'exists:activities,id', function($key, $value, $fail) {
+                $activity = Activity::findOrFail($value);
+                if ($activity->subactivities->pluck('id')->doesntContain(request()->subactivity_id)) {
+                    return $fail(':attribute ist nicht vorhanden.');
+                }
+            }],
             'subactivity_id' => 'required|numeric|exists:subactivities,id',
             'members' => 'array',
             'members.*' => 'numeric|exists:members,id',
@@ -64,7 +70,7 @@ class MassStoreAction
         });
     }
 
-    public function asController(ActionRequest $request): void
+    public function asController(ActionRequest $request): JsonResponse
     {
         /**
          * @var array{members: array<int, int>, group_id: int, activity_id: int, subactivity_id: int}
@@ -77,6 +83,16 @@ class MassStoreAction
             Subactivity::findOrFail($input['subactivity_id']),
             $input['members'],
         );
+
+        return response()->json([], 200);
+    }
+
+    public function getValidationAttributes(): array {
+        return [
+            'activity_id' => 'Tätigkeit',
+            'subactivity_id' => 'Untertätigkeit',
+            'group_id' => 'Gruppe',
+        ];
     }
 
     /**
diff --git a/tests/EndToEnd/MassstoreActionTest.php b/tests/EndToEnd/MassstoreActionTest.php
index 37f08caa..aac486f3 100644
--- a/tests/EndToEnd/MassstoreActionTest.php
+++ b/tests/EndToEnd/MassstoreActionTest.php
@@ -16,68 +16,79 @@ use Tests\EndToEndTestCase;
 use Throwable;
 use Zoomyboy\LaravelNami\Fakes\MembershipFake;
 
-class MassstoreActionTest extends EndToEndTestCase
-{
+uses(EndToEndTestCase::class);
 
-    public function testItFiresActionJobWhenUsingController(): void
-    {
-        Queue::fake();
-        $this->login()->loginNami()->withoutExceptionHandling();
-        $member = Member::factory()->defaults()->create();
-        $activity = Activity::factory()->create();
-        $subactivity = Subactivity::factory()->create();
-        $group = Group::factory()->create();
+it('testItFiresActionJobWhenUsingController', function() {
+    Queue::fake();
+    $this->login()->loginNami()->withoutExceptionHandling();
+    $member = Member::factory()->defaults()->create();
+    $activity = Activity::factory()
+        ->hasAttached(Subactivity::factory())
+        ->create();
+    $group = Group::factory()->create();
 
-        $this->postJson(route('membership.masslist.store'), [
-            'members' => [$member->id],
-            'activity_id' => $activity->id,
-            'subactivity_id' => $subactivity->id,
-            'group_id' => $group->id,
-        ]);
-        MassStoreAction::assertPushed(fn ($action, $params) => $params[0]->is($group) && $params[1]->is($activity) && $params[2]->is($subactivity) && $params[3][0] === $member->id);
-    }
+    $subactivity = $activity->subactivities()->first();
+    $this->postJson(route('membership.masslist.store'), [
+        'members' => [$member->id],
+        'activity_id' => $activity->id,
+        'subactivity_id' => $subactivity->id,
+        'group_id' => $group->id,
+    ]);
+    MassStoreAction::assertPushed(fn ($action, $params) => $params[0]->is($group) && $params[1]->is($activity) && $params[2]->is($subactivity) && $params[3][0] === $member->id);
+});
 
-    public function testItCreatesAMembership(): void
-    {
-        MembershipDestroyAction::partialMock()->shouldReceive('handle')->never();
-        MembershipStoreAction::partialMock()->shouldReceive('handle')->once();
-        $member = Member::factory()->defaults()->create();
-        $activity = Activity::factory()->create();
-        $subactivity = Subactivity::factory()->create();
-        $group = Group::factory()->create();
+it('testItCreatesAMembership', function() {
+    MembershipDestroyAction::partialMock()->shouldReceive('handle')->never();
+    MembershipStoreAction::partialMock()->shouldReceive('handle')->once();
+    $member = Member::factory()->defaults()->create();
+    $activity = Activity::factory()->create();
+    $subactivity = Subactivity::factory()->create();
+    $group = Group::factory()->create();
 
-        MassStoreAction::run($group, $activity, $subactivity, [$member->id]);
-    }
+    MassStoreAction::run($group, $activity, $subactivity, [$member->id]);
+});
 
-    public function testItDeletesAMembership(): void
-    {
-        MembershipDestroyAction::partialMock()->shouldReceive('handle')->once();
-        MembershipStoreAction::partialMock()->shouldReceive('handle')->never();
-        ResyncAction::partialMock()->shouldReceive('handle')->once();
+it('cannot create membership when activity and subactivity doesnt belong together', function() {
+    $this->login()->loginNami();
+    $member = Member::factory()->defaults()->create();
+    $activity = Activity::factory()->create();
+    $subactivity = Subactivity::factory()->create();
+    $group = Group::factory()->create();
 
-        $member = Member::factory()->defaults()->has(Membership::factory()->inLocal('Leiter*in', 'Rover'))->create();
+    $this->postJson(route('membership.masslist.store'), [
+        'members' => [$member->id],
+        'activity_id' => $activity->id,
+        'subactivity_id' => $subactivity->id,
+        'group_id' => $group->id,
+    ])->assertJsonValidationErrors(['activity_id' => 'Tätigkeit ist nicht vorhanden.']);
+});
 
+it('testItDeletesAMembership', function() {
+    MembershipDestroyAction::partialMock()->shouldReceive('handle')->once();
+    MembershipStoreAction::partialMock()->shouldReceive('handle')->never();
+    ResyncAction::partialMock()->shouldReceive('handle')->once();
+
+    $member = Member::factory()->defaults()->has(Membership::factory()->inLocal('Leiter*in', 'Rover'))->create();
+
+    MassStoreAction::run($member->memberships->first()->group, $member->memberships->first()->activity, $member->memberships->first()->subactivity, []);
+});
+
+it('testItRollsbackWhenDeletionFails', function() {
+    app(MembershipFake::class)
+        ->shows(3, ['id' => 55])
+        ->shows(3, ['id' => 56])
+        ->destroysSuccessfully(3, 55)
+        ->failsDeleting(3, 56);
+    $this->login()->loginNami();
+
+    $member = Member::factory()->defaults()->inNami(3)
+        ->has(Membership::factory()->in('Leiter*in', 10, 'Rover', 11)->inNami(55))
+        ->has(Membership::factory()->in('Leiter*in', 10, 'Jungpfadfinder', 12)->inNami(56))
+        ->create();
+
+    try {
         MassStoreAction::run($member->memberships->first()->group, $member->memberships->first()->activity, $member->memberships->first()->subactivity, []);
+    } catch (Throwable $e) {
     }
-
-    public function testItRollsbackWhenDeletionFails(): void
-    {
-        app(MembershipFake::class)
-            ->shows(3, ['id' => 55])
-            ->shows(3, ['id' => 56])
-            ->destroysSuccessfully(3, 55)
-            ->failsDeleting(3, 56);
-        $this->login()->loginNami();
-
-        $member = Member::factory()->defaults()->inNami(3)
-            ->has(Membership::factory()->in('Leiter*in', 10, 'Rover', 11)->inNami(55))
-            ->has(Membership::factory()->in('Leiter*in', 10, 'Jungpfadfinder', 12)->inNami(56))
-            ->create();
-
-        try {
-            MassStoreAction::run($member->memberships->first()->group, $member->memberships->first()->activity, $member->memberships->first()->subactivity, []);
-        } catch (Throwable $e) {
-        }
-        $this->assertDatabaseCount('memberships', 2);
-    }
-}
+    $this->assertDatabaseCount('memberships', 2);
+});