diff --git a/.changes/unreleased/Feature-20240207-164038.yaml b/.changes/unreleased/Feature-20240207-164038.yaml
new file mode 100644
index 000000000..ff5096036
--- /dev/null
+++ b/.changes/unreleased/Feature-20240207-164038.yaml
@@ -0,0 +1,5 @@
+kind: Feature
+body: Allow to group activities linked with accompanying period by reason
+time: 2024-02-07T16:40:38.408575109+01:00
+custom:
+  Issue: "229"
diff --git a/src/Bundle/ChillActivityBundle/Export/Aggregator/PersonAggregators/ActivityReasonAggregator.php b/src/Bundle/ChillActivityBundle/Export/Aggregator/ActivityReasonAggregator.php
similarity index 86%
rename from src/Bundle/ChillActivityBundle/Export/Aggregator/PersonAggregators/ActivityReasonAggregator.php
rename to src/Bundle/ChillActivityBundle/Export/Aggregator/ActivityReasonAggregator.php
index 569c4ca9a..9945fd80a 100644
--- a/src/Bundle/ChillActivityBundle/Export/Aggregator/PersonAggregators/ActivityReasonAggregator.php
+++ b/src/Bundle/ChillActivityBundle/Export/Aggregator/ActivityReasonAggregator.php
@@ -9,7 +9,7 @@ declare(strict_types=1);
  * the LICENSE file that was distributed with this source code.
  */
 
-namespace Chill\ActivityBundle\Export\Aggregator\PersonAggregators;
+namespace Chill\ActivityBundle\Export\Aggregator;
 
 use Chill\ActivityBundle\Export\Declarations;
 use Chill\ActivityBundle\Repository\ActivityReasonCategoryRepository;
@@ -25,8 +25,11 @@ use Symfony\Component\Validator\Context\ExecutionContextInterface;
 
 class ActivityReasonAggregator implements AggregatorInterface, ExportElementValidatedInterface
 {
-    public function __construct(protected ActivityReasonCategoryRepository $activityReasonCategoryRepository, protected ActivityReasonRepository $activityReasonRepository, protected TranslatableStringHelper $translatableStringHelper)
-    {
+    public function __construct(
+        protected ActivityReasonCategoryRepository $activityReasonCategoryRepository,
+        protected ActivityReasonRepository $activityReasonRepository,
+        protected TranslatableStringHelper $translatableStringHelper
+    ) {
     }
 
     public function addRole(): ?string
@@ -51,7 +54,7 @@ class ActivityReasonAggregator implements AggregatorInterface, ExportElementVali
 
         // make a jointure only if needed
         if (!\in_array('actreasons', $qb->getAllAliases(), true)) {
-            $qb->innerJoin('activity.reasons', 'actreasons');
+            $qb->leftJoin('activity.reasons', 'actreasons');
         }
 
         // join category if necessary
@@ -62,19 +65,12 @@ class ActivityReasonAggregator implements AggregatorInterface, ExportElementVali
             }
         }
 
-        // add the "group by" part
-        $groupBy = $qb->getDQLPart('groupBy');
-
-        if (\count($groupBy) > 0) {
-            $qb->addGroupBy($alias);
-        } else {
-            $qb->groupBy($alias);
-        }
+        $qb->addGroupBy($alias);
     }
 
     public function applyOn(): string
     {
-        return Declarations::ACTIVITY_PERSON;
+        return Declarations::ACTIVITY;
     }
 
     public function buildForm(FormBuilderInterface $builder)
@@ -96,7 +92,9 @@ class ActivityReasonAggregator implements AggregatorInterface, ExportElementVali
 
     public function getFormDefaultData(): array
     {
-        return [];
+        return [
+            'level' => 'reasons',
+        ];
     }
 
     public function getLabels($key, array $values, $data)
diff --git a/src/Bundle/ChillActivityBundle/Tests/Export/Aggregator/PersonAggregators/ActivityReasonAggregatorTest.php b/src/Bundle/ChillActivityBundle/Tests/Export/Aggregator/ActivityReasonAggregatorTest.php
similarity index 69%
rename from src/Bundle/ChillActivityBundle/Tests/Export/Aggregator/PersonAggregators/ActivityReasonAggregatorTest.php
rename to src/Bundle/ChillActivityBundle/Tests/Export/Aggregator/ActivityReasonAggregatorTest.php
index 004de0b99..3e1d473f0 100644
--- a/src/Bundle/ChillActivityBundle/Tests/Export/Aggregator/PersonAggregators/ActivityReasonAggregatorTest.php
+++ b/src/Bundle/ChillActivityBundle/Tests/Export/Aggregator/ActivityReasonAggregatorTest.php
@@ -9,10 +9,10 @@ declare(strict_types=1);
  * the LICENSE file that was distributed with this source code.
  */
 
-namespace Chill\ActivityBundle\Tests\Export\Aggregator\PersonAggregators;
+namespace Chill\ActivityBundle\Tests\Export\Aggregator;
 
 use Chill\ActivityBundle\Entity\Activity;
-use Chill\ActivityBundle\Export\Aggregator\PersonAggregators\ActivityReasonAggregator;
+use Chill\ActivityBundle\Export\Aggregator\ActivityReasonAggregator;
 use Chill\MainBundle\Test\Export\AbstractAggregatorTest;
 use Doctrine\ORM\EntityManagerInterface;
 use Prophecy\PhpUnit\ProphecyTrait;
@@ -33,14 +33,14 @@ final class ActivityReasonAggregatorTest extends AbstractAggregatorTest
         self::bootKernel();
 
         $this->aggregator = self::$container->get(ActivityReasonAggregator::class);
+        /*
+                $request = $this->prophesize()
+                    ->willExtend(\Symfony\Component\HttpFoundation\Request::class);
 
-        $request = $this->prophesize()
-            ->willExtend(\Symfony\Component\HttpFoundation\Request::class);
+                $request->getLocale()->willReturn('fr');
 
-        $request->getLocale()->willReturn('fr');
-
-        self::$container->get('request_stack')
-            ->push($request->reveal());
+                self::$container->get('request_stack')
+                    ->push($request->reveal());*/
     }
 
     public function getAggregator()
@@ -65,7 +65,12 @@ final class ActivityReasonAggregatorTest extends AbstractAggregatorTest
         return [
             $em->createQueryBuilder()
                 ->select('count(activity.id)')
-                ->from(Activity::class, 'activity'),
+                ->from(Activity::class, 'activity')
+                ->join('activity.person', 'person'),
+            $em->createQueryBuilder()
+                ->select('count(activity.id)')
+                ->from(Activity::class, 'activity')
+                ->join('activity.accompanyingPeriod', 'accompanyingPeriod'),
             $em->createQueryBuilder()
                 ->select('count(activity.id)')
                 ->from(Activity::class, 'activity')
diff --git a/src/Bundle/ChillActivityBundle/config/services/export.yaml b/src/Bundle/ChillActivityBundle/config/services/export.yaml
index ef691ba0d..b52911295 100644
--- a/src/Bundle/ChillActivityBundle/config/services/export.yaml
+++ b/src/Bundle/ChillActivityBundle/config/services/export.yaml
@@ -153,7 +153,7 @@ services:
 
 
     ## Aggregators
-    Chill\ActivityBundle\Export\Aggregator\PersonAggregators\ActivityReasonAggregator:
+    Chill\ActivityBundle\Export\Aggregator\ActivityReasonAggregator:
         tags:
             - { name: chill.export_aggregator, alias: activity_reason_aggregator }