diff --git a/src/main/java/org/gridsuite/study/server/service/StudyService.java b/src/main/java/org/gridsuite/study/server/service/StudyService.java
index 5908cce9f..d3ab24899 100644
--- a/src/main/java/org/gridsuite/study/server/service/StudyService.java
+++ b/src/main/java/org/gridsuite/study/server/service/StudyService.java
@@ -3370,14 +3370,9 @@ public void insertVoltageInitModifications(UUID studyUuid, UUID nodeUuid, UUID r
                 for (UUID otherRootNetwork : rootNetworkToDeactivateUuids) {
                     rootNetworkNodeInfoService.updateModificationsToExclude(nodeUuid, otherRootNetwork, Set.of(networkModificationResults.modificationUuids().getFirst()), false);
                 }
-                int index = 0;
-                // for each NetworkModificationResult, send an impact notification - studyRootNetworkEntities are ordered in the same way as networkModificationResults
-                for (Optional<NetworkModificationResult> modificationResultOpt : networkModificationResults.modificationResults()) {
-                    if (modificationResultOpt.isPresent() && studyRootNetworkEntities.get(index) != null) {
-                        emitNetworkModificationImpacts(studyUuid, nodeUuid, studyRootNetworkEntities.get(index).getId(), modificationResultOpt.get());
-                    }
-                    index++;
-                }
+                // The modification was applied only on rootNetworkUuid, so the single result must be attributed to it
+                networkModificationResults.modificationResults().getFirst()
+                    .ifPresent(result -> emitNetworkModificationImpacts(studyUuid, nodeUuid, rootNetworkUuid, result));
             }
 
             voltageInitService.resetModificationsGroupUuid(resultUuid);