diff --git a/CHANGELOG.md b/CHANGELOG.md
index 09737af6..5159c2bd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 2.6.1 [TODO]
+### Fixed
+- Fixed V1 schedules endpoint returning an empty list when V1 schedules have a null `partitionId`.
+
 ## 2.6.0 [2026-04-29]
 ### Fixed
 - Prevent missing contextual external or previous files from clearing existing contextual data.
diff --git a/src/main/java/fr/insee/genesis/domain/model/context/DataProcessingContextModel.java b/src/main/java/fr/insee/genesis/domain/model/context/DataProcessingContextModel.java
index ce5b6c70..10b27850 100644
--- a/src/main/java/fr/insee/genesis/domain/model/context/DataProcessingContextModel.java
+++ b/src/main/java/fr/insee/genesis/domain/model/context/DataProcessingContextModel.java
@@ -13,6 +13,7 @@
 
 import java.time.LocalDateTime;
 import java.util.List;
+import java.util.Objects;
 
 @Data
 @Builder
@@ -38,9 +39,9 @@ public List<ScheduleResponseDto> toScheduleV1ResponseDtos() {
         }
 
         return kraftwerkExecutionScheduleList.stream()
-                .filter(schedule -> schedule != null && schedule.getPartitionId() != null)
+                .filter(Objects::nonNull)
                 .map(schedule -> ScheduleResponseDto.builder()
-                        .collectionInstrumentId(schedule.getPartitionId())
+                        .collectionInstrumentId(collectionInstrumentId)
                         .lastExecution(lastExecution)
                         .frequency(schedule.getFrequency())
                         .scheduleBeginDate(schedule.getScheduleBeginDate())
diff --git a/src/test/java/fr/insee/genesis/domain/model/context/DataProcessingContextModelTest.java b/src/test/java/fr/insee/genesis/domain/model/context/DataProcessingContextModelTest.java
index 8b43d210..5139c0df 100644
--- a/src/test/java/fr/insee/genesis/domain/model/context/DataProcessingContextModelTest.java
+++ b/src/test/java/fr/insee/genesis/domain/model/context/DataProcessingContextModelTest.java
@@ -194,7 +194,7 @@ void toScheduleV1ResponseDtos_null_schedule_ignored_test() {
         }
 
         @Test
-        void toScheduleV1ResponseDtos_no_partitionId_schedule_ignored_test() {
+        void toScheduleV1ResponseDtos_no_partitionId_schedule_not_ignored_test() {
             //GIVEN
             String collectionInstrumentId = "test";
             String frequency = "0 0 0 0 0 0";
@@ -231,7 +231,7 @@ void toScheduleV1ResponseDtos_no_partitionId_schedule_ignored_test() {
             List<ScheduleResponseDto> scheduleResponseDtoList = dataProcessingContextModel.toScheduleV1ResponseDtos();
 
             //THEN
-            Assertions.assertThat(scheduleResponseDtoList).hasSize(1);
+            Assertions.assertThat(scheduleResponseDtoList).hasSize(2);
         }
     }
 
diff --git a/src/test/java/fr/insee/genesis/domain/service/context/DataProcessingContextServiceTest.java b/src/test/java/fr/insee/genesis/domain/service/context/DataProcessingContextServiceTest.java
index 89a0ae92..c5f553db 100644
--- a/src/test/java/fr/insee/genesis/domain/service/context/DataProcessingContextServiceTest.java
+++ b/src/test/java/fr/insee/genesis/domain/service/context/DataProcessingContextServiceTest.java
@@ -263,6 +263,7 @@ void getSchedulesV1_test() {
 
         DataProcessingContextDocument dataProcessingContextDocument = new DataProcessingContextDocument();
         dataProcessingContextDocument.setPartitionId(collectionInstrumentId);
+        dataProcessingContextDocument.setCollectionInstrumentId(collectionInstrumentId);
         dataProcessingContextDocument.setKraftwerkExecutionScheduleList(kraftwerkExecutionScheduleList);
         when(dataProcessingContextPersistancePort.findAll()).thenReturn(List.of(dataProcessingContextDocument));