diff --git a/src/main/java/org/gridsuite/modification/server/modifications/ModificationUtils.java b/src/main/java/org/gridsuite/modification/server/modifications/ModificationUtils.java
index fec6afbbb..a83902c62 100644
--- a/src/main/java/org/gridsuite/modification/server/modifications/ModificationUtils.java
+++ b/src/main/java/org/gridsuite/modification/server/modifications/ModificationUtils.java
@@ -55,8 +55,6 @@ public final class ModificationUtils {
     public static final String CONNECTION_DIRECTION_FIELD_NAME = "Connection direction";
     public static final String CONNECTION_POSITION_FIELD_NAME = "Connection position";
 
-    public static final String ACTIVE_POWER_CONTROL_DROOP_P0_REQUIRED_ERROR_MSG = "Angle droop active power control, Droop and P0 must be provided together";
-
     private ModificationUtils() {
     }
 
@@ -1307,20 +1305,5 @@ public static void insertReportNode(ReportNode parent, ReportNode child) {
         }
     }
 
-    public static void checkHvdcDroop(boolean isPresentAngleDroopActivePowerControl, boolean isPresentDroop, boolean isPresentP0) {
-        // all fields should be filled => OK extension will be created
-        if (isPresentAngleDroopActivePowerControl && isPresentDroop && isPresentP0) {
-            return;
-        }
-        // at least one field is filled but not for others => NOT OK
-        if (isPresentAngleDroopActivePowerControl || isPresentDroop || isPresentP0) {
-            throw new NetworkModificationException(WRONG_HVDC_ANGLE_DROOP_ACTIVE_POWER_CONTROL, ACTIVE_POWER_CONTROL_DROOP_P0_REQUIRED_ERROR_MSG);
-        }
-        // all fields are not filled => OK extension will not be created
-    }
-
-    public static boolean shouldCreateHvdcDroopActivePowerControlExtension(boolean isPresentAngleDroopActivePowerControl, boolean isPresentDroop, boolean isPresentP0) {
-        return isPresentAngleDroopActivePowerControl && isPresentDroop && isPresentP0;
-    }
 }
 
diff --git a/src/main/java/org/gridsuite/modification/server/modifications/VscCreation.java b/src/main/java/org/gridsuite/modification/server/modifications/VscCreation.java
index 60158922e..6e5e283f3 100644
--- a/src/main/java/org/gridsuite/modification/server/modifications/VscCreation.java
+++ b/src/main/java/org/gridsuite/modification/server/modifications/VscCreation.java
@@ -24,8 +24,8 @@
 
 import static org.gridsuite.modification.server.NetworkModificationException.Type.CREATE_VSC_ERROR;
 import static org.gridsuite.modification.server.NetworkModificationException.Type.HVDC_LINE_ALREADY_EXISTS;
-import static org.gridsuite.modification.server.modifications.ModificationUtils.checkHvdcDroop;
-import static org.gridsuite.modification.server.modifications.ModificationUtils.shouldCreateHvdcDroopActivePowerControlExtension;
+import static org.gridsuite.modification.server.modifications.VscModification.checkHvdcDroop;
+import static org.gridsuite.modification.server.modifications.VscModification.shouldCreateHvdcDroopActivePowerControlExtension;
 
 /**
  * @author Seddik Yengui <seddik.yengui at rte-france.com>
diff --git a/src/main/java/org/gridsuite/modification/server/modifications/VscModification.java b/src/main/java/org/gridsuite/modification/server/modifications/VscModification.java
index 00cd95a0b..5ecd9b08c 100644
--- a/src/main/java/org/gridsuite/modification/server/modifications/VscModification.java
+++ b/src/main/java/org/gridsuite/modification/server/modifications/VscModification.java
@@ -21,10 +21,7 @@
 import javax.annotation.Nonnull;
 import java.util.*;
 
-import static org.gridsuite.modification.server.NetworkModificationException.Type.MODIFY_BATTERY_ERROR;
-import static org.gridsuite.modification.server.NetworkModificationException.Type.MODIFY_VSC_ERROR;
-import static org.gridsuite.modification.server.modifications.ModificationUtils.checkHvdcDroop;
-import static org.gridsuite.modification.server.modifications.ModificationUtils.shouldCreateHvdcDroopActivePowerControlExtension;
+import static org.gridsuite.modification.server.NetworkModificationException.Type.*;
 import static org.gridsuite.modification.server.modifications.VscCreation.VSC_CHARACTERISTICS;
 import static org.gridsuite.modification.server.modifications.VscCreation.VSC_SETPOINTS;
 
@@ -37,6 +34,7 @@ public class VscModification extends AbstractModification {
     public static final String ANGLE_DROOP_ACTIVE_POWER_CONTROL_FIELD = "AngleDroopActivePowerControl";
     public static final String DROOP_FIELD = "Droop";
     public static final String P0_FIELD = "P0";
+    public static final String ACTIVE_POWER_CONTROL_DROOP_P0_REQUIRED_ERROR_MSG = "Angle droop active power control, Droop and P0 must be provided together";
 
     private final VscModificationInfos modificationInfos;
 
@@ -44,6 +42,22 @@ public VscModification(VscModificationInfos vscModificationInfos) {
         this.modificationInfos = vscModificationInfos;
     }
 
+    public static void checkHvdcDroop(boolean isPresentAngleDroopActivePowerControl, boolean isPresentDroop, boolean isPresentP0) {
+        // all fields should be filled => OK extension will be created
+        if (isPresentAngleDroopActivePowerControl && isPresentDroop && isPresentP0) {
+            return;
+        }
+        // at least one field is filled but not for others => NOT OK
+        if (isPresentAngleDroopActivePowerControl || isPresentDroop || isPresentP0) {
+            throw new NetworkModificationException(WRONG_HVDC_ANGLE_DROOP_ACTIVE_POWER_CONTROL, ACTIVE_POWER_CONTROL_DROOP_P0_REQUIRED_ERROR_MSG);
+        }
+        // all fields are not filled => OK extension will not be created
+    }
+
+    public static boolean shouldCreateHvdcDroopActivePowerControlExtension(boolean isPresentAngleDroopActivePowerControl, boolean isPresentDroop, boolean isPresentP0) {
+        return isPresentAngleDroopActivePowerControl && isPresentDroop && isPresentP0;
+    }
+
     protected void checkConverterStation(@Nonnull ConverterStationModificationInfos converterStationModificationInfos, @Nonnull VscConverterStation vscConverterStation) {
         String errorMessage = "Converter station '" + converterStationModificationInfos.getEquipmentId() + "' : ";
         ModificationUtils.getInstance().checkReactiveLimit(vscConverterStation, converterStationModificationInfos.getMinQ(), converterStationModificationInfos.getMaxQ(),
diff --git a/src/test/java/org/gridsuite/modification/server/modifications/VscCreationTest.java b/src/test/java/org/gridsuite/modification/server/modifications/VscCreationTest.java
index 9c5148c8e..7db6ece80 100644
--- a/src/test/java/org/gridsuite/modification/server/modifications/VscCreationTest.java
+++ b/src/test/java/org/gridsuite/modification/server/modifications/VscCreationTest.java
@@ -26,7 +26,7 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.gridsuite.modification.server.NetworkModificationException.Type.*;
-import static org.gridsuite.modification.server.modifications.ModificationUtils.ACTIVE_POWER_CONTROL_DROOP_P0_REQUIRED_ERROR_MSG;
+import static org.gridsuite.modification.server.modifications.VscModification.ACTIVE_POWER_CONTROL_DROOP_P0_REQUIRED_ERROR_MSG;
 import static org.gridsuite.modification.server.utils.TestUtils.assertLogMessage;
 import static org.junit.Assert.*;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
diff --git a/src/test/java/org/gridsuite/modification/server/modifications/VscModificationTest.java b/src/test/java/org/gridsuite/modification/server/modifications/VscModificationTest.java
index 435805e24..d72762455 100644
--- a/src/test/java/org/gridsuite/modification/server/modifications/VscModificationTest.java
+++ b/src/test/java/org/gridsuite/modification/server/modifications/VscModificationTest.java
@@ -30,7 +30,7 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.gridsuite.modification.server.NetworkModificationException.Type.WRONG_HVDC_ANGLE_DROOP_ACTIVE_POWER_CONTROL;
-import static org.gridsuite.modification.server.modifications.ModificationUtils.ACTIVE_POWER_CONTROL_DROOP_P0_REQUIRED_ERROR_MSG;
+import static org.gridsuite.modification.server.modifications.VscModification.ACTIVE_POWER_CONTROL_DROOP_P0_REQUIRED_ERROR_MSG;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
 import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
@@ -244,39 +244,6 @@ public void testActivateHvdcAngleDroopActivePowerControl() throws Exception {
         Assert.assertTrue(activePowerControl.isEnabled());
     }
 
-//    @ParameterizedTest(name = "Test modification with absent droop infos when extension does not yet exist [{index}] {0}, {1}, {2}")
-//    @CsvSource({
-//        "true,false,false",
-//        "true,true,false",
-//        "true,false,true",
-//        "false,true,false",
-//        "false,true,true",
-//        "false,false,true",
-//    })
-//    void testHvdcAngleDroopActivePowerControlWithAbsentInfos(boolean isPresentAngleDroopActivePowerControl, boolean isPresentDroop, boolean isPresentP0) {
-//        var networkuuid = UUID.randomUUID();
-//        Network networkWithoutExt = NetworkCreation.createWithVSC(networkuuid, false);
-//        VscModificationInfos modificationInfos = (VscModificationInfos) buildModification();
-//
-//        // reset null depending to test arguments
-//        if (!isPresentAngleDroopActivePowerControl) {
-//            modificationInfos.setAngleDroopActivePowerControl(null);
-//        }
-//        if (!isPresentDroop) {
-//            modificationInfos.setDroop(null);
-//        }
-//        if (!isPresentP0) {
-//            modificationInfos.setP0(null);
-//        }
-//
-//        VscModification wrongVscModification = new VscModification(modificationInfos);
-//        String message = Assert.assertThrows(NetworkModificationException.class,
-//                () -> wrongVscModification.check(networkWithoutExt))
-//            .getMessage();
-//        assertThat(message).isEqualTo(WRONG_HVDC_ANGLE_DROOP_ACTIVE_POWER_CONTROL.name() + " : "
-//              + ACTIVE_POWER_CONTROL_DROOP_P0_REQUIRED_ERROR_MSG);
-//    }
-
     @Test
     public void testAngleDroopActivePowerControlWithAbsentInfos() {
         var networkuuid = UUID.randomUUID();