diff --git a/sources/TerminalStrip/UndoCommand/changeterminallevel.cpp b/sources/TerminalStrip/UndoCommand/changeterminallevel.cpp
new file mode 100644
index 000000000..42c5dceba
--- /dev/null
+++ b/sources/TerminalStrip/UndoCommand/changeterminallevel.cpp
@@ -0,0 +1,43 @@
+/*
+		Copyright 2006-2021 The QElectroTech Team
+		This file is part of QElectroTech.
+
+		QElectroTech is free software: you can redistribute it and/or modify
+		it under the terms of the GNU General Public License as published by
+		the Free Software Foundation, either version 2 of the License, or
+		(at your option) any later version.
+
+		QElectroTech is distributed in the hope that it will be useful,
+		but WITHOUT ANY WARRANTY; without even the implied warranty of
+		MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+		GNU General Public License for more details.
+
+		You should have received a copy of the GNU General Public License
+		along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include "changeterminallevel.h"
+
+ChangeTerminalLevel::ChangeTerminalLevel(TerminalStrip *strip,
+										 const RealTerminalData &real_terminal,
+										 int level,
+										 QUndoCommand *parent) :
+	QUndoCommand(parent),
+	m_strip(strip),
+	m_real_terminal(real_terminal),
+	m_new_level(level),
+	m_old_level(real_terminal.level_)
+{}
+
+void ChangeTerminalLevel::undo()
+{
+	if (m_strip) {
+		m_strip->setLevel(m_real_terminal, m_old_level);
+	}
+}
+
+void ChangeTerminalLevel::redo()
+{
+	if (m_strip) {
+		m_strip->setLevel(m_real_terminal, m_new_level);
+	}
+}
diff --git a/sources/TerminalStrip/UndoCommand/changeterminallevel.h b/sources/TerminalStrip/UndoCommand/changeterminallevel.h
new file mode 100644
index 000000000..39b9a3c1a
--- /dev/null
+++ b/sources/TerminalStrip/UndoCommand/changeterminallevel.h
@@ -0,0 +1,42 @@
+/*
+		Copyright 2006-2021 The QElectroTech Team
+		This file is part of QElectroTech.
+
+		QElectroTech is free software: you can redistribute it and/or modify
+		it under the terms of the GNU General Public License as published by
+		the Free Software Foundation, either version 2 of the License, or
+		(at your option) any later version.
+
+		QElectroTech is distributed in the hope that it will be useful,
+		but WITHOUT ANY WARRANTY; without even the implied warranty of
+		MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+		GNU General Public License for more details.
+
+		You should have received a copy of the GNU General Public License
+		along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef CHANGETERMINALLEVEL_H
+#define CHANGETERMINALLEVEL_H
+
+#include <QUndoCommand>
+#include <QPointer>
+#include "../terminalstrip.h"
+
+class ChangeTerminalLevel : public QUndoCommand
+{
+	public:
+		ChangeTerminalLevel(TerminalStrip *strip,
+							const RealTerminalData &real_terminal,
+							int level,
+							QUndoCommand *parent = nullptr);
+
+		void undo() override;
+		void redo() override;
+
+	private:
+		QPointer<TerminalStrip> m_strip;
+		RealTerminalData m_real_terminal;
+		int m_new_level, m_old_level;
+};
+
+#endif // CHANGETERMINALLEVEL_H
diff --git a/sources/TerminalStrip/terminalstrip.cpp b/sources/TerminalStrip/terminalstrip.cpp
index d202f2d51..d6ec3a17c 100644
--- a/sources/TerminalStrip/terminalstrip.cpp
+++ b/sources/TerminalStrip/terminalstrip.cpp
@@ -289,6 +289,23 @@ class PhysicalTerminal
 			return m_real_terminal.indexOf(terminal);
 		}
 
+		/**
+		 * @brief setLevelOf
+		 * Change the level of \p terminal
+		 * @param terminal
+		 * @param level
+		 */
+		bool setLevelOf(shared_real_terminal terminal, int level)
+		{
+			const int i = m_real_terminal.indexOf(terminal);
+			if (i >= 0)
+			{
+				m_real_terminal.swapItemsAt(i, std::min(level, m_real_terminal.size()-1));
+				return true;
+			}
+			return false;
+		}
+
 		/**
 		 * @brief terminals
 		 * @return A vector of real terminal who compose this physical terminal
@@ -570,14 +587,14 @@ QVector<PhysicalTerminalData> TerminalStrip::physicalTerminalData() const
  * @param sorted_vector
  * @return true is successfully sorted.
  */
-bool TerminalStrip::setOrderTo(QVector<PhysicalTerminalData> sorted_vector)
+bool TerminalStrip::setOrderTo(const QVector<PhysicalTerminalData> &sorted_vector)
 {
 	if (sorted_vector.size() != m_physical_terminals.size()) {
 		return false;
 	}
 
 	QVector<QSharedPointer<PhysicalTerminal>> new_order;
-	for (auto ptd : sorted_vector)
+	for (const auto &ptd : sorted_vector)
 	{
 		const auto physical_t = physicalTerminalForUuid(ptd.uuid_);
 		if (physical_t.isNull()) {
@@ -677,6 +694,32 @@ void TerminalStrip::unGroupTerminals(const QVector<RealTerminalData> &terminals_
 	}
 }
 
+/**
+ * @brief TerminalStrip::setLevel
+ * @param real_terminal_data
+ * @param level
+ * @return
+ */
+bool TerminalStrip::setLevel(const RealTerminalData &real_terminal_data, int level)
+{
+	auto real_terminal = realTerminalForUuid(real_terminal_data.real_terminal_uuid);
+	if (real_terminal)
+	{
+		auto physical_terminal = physicalTerminal(real_terminal);
+		if (physical_terminal)
+		{
+			if (physical_terminal->terminals().size() > 1 &&
+				physical_terminal->setLevelOf(real_terminal, level))
+			{
+				emit orderChanged();
+				return true;
+			}
+		}
+	}
+
+	return false;
+}
+
 /**
  * @brief TerminalStrip::terminalElement
  * @return A vector of all terminal element owned by this strip
diff --git a/sources/TerminalStrip/terminalstrip.h b/sources/TerminalStrip/terminalstrip.h
index b2f165a58..dd24cd5cb 100644
--- a/sources/TerminalStrip/terminalstrip.h
+++ b/sources/TerminalStrip/terminalstrip.h
@@ -117,9 +117,10 @@ class TerminalStrip : public QObject
 		PhysicalTerminalData physicalTerminalData(int index) const;
 		PhysicalTerminalData physicalTerminalData (const RealTerminalData &real_data) const;
 		QVector<PhysicalTerminalData> physicalTerminalData() const;
-		bool setOrderTo(QVector<PhysicalTerminalData> sorted_vector);
+		bool setOrderTo(const QVector<PhysicalTerminalData> &sorted_vector);
 		bool groupTerminals(const PhysicalTerminalData &receiver_terminal, const QVector<RealTerminalData> &added_terminals);
 		void unGroupTerminals(const QVector<RealTerminalData> &terminals_to_ungroup);
+		bool setLevel(const RealTerminalData &real_terminal_data, int level);
 
 		QVector<QPointer<Element>> terminalElement() const;
 
diff --git a/sources/TerminalStrip/ui/terminalstripeditor.cpp b/sources/TerminalStrip/ui/terminalstripeditor.cpp
index 3b70c3262..b878d1340 100644
--- a/sources/TerminalStrip/ui/terminalstripeditor.cpp
+++ b/sources/TerminalStrip/ui/terminalstripeditor.cpp
@@ -32,6 +32,7 @@
 #include "../diagram.h"
 #include "../UndoCommand/sortterminalstripcommand.h"
 #include "../UndoCommand/groupterminalscommand.h"
+#include "../UndoCommand/changeterminallevel.h"
 
 #include <QTreeWidgetItem>
 
@@ -352,10 +353,12 @@ void TerminalStripEditor::selectionChanged()
 
 	const auto index_list = ui->m_table_widget->selectionModel()->selectedIndexes();
 	const auto terminal_vector = m_model->physicalTerminalDataForIndex(index_list);
+	const auto real_terminal_vector = m_model->realTerminalDataForIndex(index_list);
 
+		//Enable/disable group button
 	ui->m_group_terminals_pb->setEnabled(terminal_vector.size() > 1 ? true : false);
 
-
+		//Enable/disable ungroup button
 	auto it_= std::find_if(terminal_vector.constBegin(), terminal_vector.constEnd(), [](auto &data)
 	{
 		if (data.real_terminals_vector.size() >= 2) {
@@ -500,17 +503,22 @@ void TerminalStripEditor::on_m_dialog_button_box_clicked(QAbstractButton *button
 
 			if (m_model)
 			{
-				for (auto modified_data : m_model->modifiedRealTerminalData())
+				for (const auto &data_ : m_model->modifiedRealTerminalData())
 				{
-					auto element = modified_data.element_;
+					auto original_ = data_.first;
+					auto edited_   = data_.second;
+					auto element   = original_.element_;
 					if (element) {
 						auto current_data = element->elementData();
-						current_data.setTerminalType(modified_data.type_);
-						current_data.setTerminalFunction(modified_data.function_);
-						current_data.setTerminalLED(modified_data.led_);
-						current_data.m_informations.addValue(QStringLiteral("label"), modified_data.label_);
+						current_data.setTerminalType(edited_.type_);
+						current_data.setTerminalFunction(edited_.function_);
+						current_data.setTerminalLED(edited_.led_);
+						current_data.m_informations.addValue(QStringLiteral("label"), edited_.label_);
 
-						m_project->undoStack()->push(new ChangeElementDataCommand(element, current_data));
+						if (element->elementData() != current_data)
+							m_project->undoStack()->push(new ChangeElementDataCommand(element, current_data));
+						if (edited_.level_)
+							m_project->undoStack()->push(new ChangeTerminalLevel(m_current_strip, original_, edited_.level_));
 					}
 				}
 			}
@@ -560,3 +568,24 @@ void TerminalStripEditor::on_m_ungroup_pb_clicked()
 	}
 }
 
+/**
+ * @brief TerminalStripEditor::on_m_level_sb_valueChanged
+ * @param arg1
+ */
+void TerminalStripEditor::on_m_level_sb_valueChanged(int arg1)
+{
+	if (m_model)
+	{
+		const auto index_list = ui->m_table_widget->selectionModel()->selectedIndexes();
+
+		for (auto index : index_list)
+		{
+			auto level_index = m_model->index(index.row(), 1, index.parent());
+			if (level_index.isValid())
+			{
+				m_model->setData(level_index, arg1);
+			}
+		}
+	}
+}
+
diff --git a/sources/TerminalStrip/ui/terminalstripeditor.h b/sources/TerminalStrip/ui/terminalstripeditor.h
index cde20120b..8115b470e 100644
--- a/sources/TerminalStrip/ui/terminalstripeditor.h
+++ b/sources/TerminalStrip/ui/terminalstripeditor.h
@@ -62,6 +62,7 @@ class TerminalStripEditor : public QDialog
 		void on_m_auto_ordering_pb_clicked();
 		void on_m_group_terminals_pb_clicked();
 		void on_m_ungroup_pb_clicked();
+		void on_m_level_sb_valueChanged(int arg1);
 
 	private:
 		Ui::TerminalStripEditor *ui;
diff --git a/sources/TerminalStrip/ui/terminalstripeditor.ui b/sources/TerminalStrip/ui/terminalstripeditor.ui
index 912f3d271..e9cd723ba 100644
--- a/sources/TerminalStrip/ui/terminalstripeditor.ui
+++ b/sources/TerminalStrip/ui/terminalstripeditor.ui
@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>1260</width>
-    <height>579</height>
+    <width>1289</width>
+    <height>645</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -179,6 +179,13 @@
     <widget class="QWidget" name="widget" native="true">
      <layout class="QGridLayout" name="gridLayout_3">
       <item row="3" column="0">
+       <widget class="QLabel" name="label_6">
+        <property name="text">
+         <string>Étage :</string>
+        </property>
+       </widget>
+      </item>
+      <item row="4" column="0">
        <spacer name="verticalSpacer">
         <property name="orientation">
          <enum>Qt::Vertical</enum>
@@ -191,24 +198,27 @@
         </property>
        </spacer>
       </item>
-      <item row="0" column="0">
-       <widget class="QPushButton" name="m_auto_ordering_pb">
+      <item row="3" column="1">
+       <widget class="QSpinBox" name="m_level_sb"/>
+      </item>
+      <item row="2" column="0" colspan="2">
+       <widget class="QPushButton" name="m_ungroup_pb">
         <property name="text">
-         <string>Position automatique</string>
+         <string>Degrouper les bornes</string>
         </property>
        </widget>
       </item>
-      <item row="1" column="0">
+      <item row="1" column="0" colspan="2">
        <widget class="QPushButton" name="m_group_terminals_pb">
         <property name="text">
          <string>Grouper les bornes</string>
         </property>
        </widget>
       </item>
-      <item row="2" column="0">
-       <widget class="QPushButton" name="m_ungroup_pb">
+      <item row="0" column="0" colspan="2">
+       <widget class="QPushButton" name="m_auto_ordering_pb">
         <property name="text">
-         <string>Degrouper les bornes</string>
+         <string>Position automatique</string>
         </property>
        </widget>
       </item>
@@ -289,13 +299,21 @@
   </customwidget>
  </customwidgets>
  <tabstops>
+  <tabstop>m_add_terminal_strip_pb</tabstop>
+  <tabstop>m_remove_terminal_strip_pb</tabstop>
+  <tabstop>m_reload_pb</tabstop>
+  <tabstop>m_auto_ordering_pb</tabstop>
+  <tabstop>m_group_terminals_pb</tabstop>
+  <tabstop>m_ungroup_pb</tabstop>
+  <tabstop>m_level_sb</tabstop>
+  <tabstop>m_terminal_strip_tw</tabstop>
+  <tabstop>m_table_widget</tabstop>
+  <tabstop>m_description_te</tabstop>
+  <tabstop>m_comment_le</tabstop>
+  <tabstop>m_name_le</tabstop>
   <tabstop>m_tab_widget</tabstop>
   <tabstop>m_installation_le</tabstop>
   <tabstop>m_location_le</tabstop>
-  <tabstop>m_name_le</tabstop>
-  <tabstop>m_comment_le</tabstop>
-  <tabstop>m_description_te</tabstop>
-  <tabstop>m_table_widget</tabstop>
  </tabstops>
  <resources>
   <include location="../../../qelectrotech.qrc"/>
diff --git a/sources/TerminalStrip/ui/terminalstripmodel.cpp b/sources/TerminalStrip/ui/terminalstripmodel.cpp
index 9d318fa41..c089dce64 100644
--- a/sources/TerminalStrip/ui/terminalstripmodel.cpp
+++ b/sources/TerminalStrip/ui/terminalstripmodel.cpp
@@ -52,7 +52,7 @@ TerminalStripModel::TerminalStripModel(TerminalStrip *terminal_strip, QObject *p
     QAbstractTableModel(parent),
     m_terminal_strip(terminal_strip)
 {
-	fillRealTerminalData();
+	fillPhysicalTerminalData();
 }
 
 int TerminalStripModel::rowCount(const QModelIndex &parent) const
@@ -64,7 +64,7 @@ int TerminalStripModel::rowCount(const QModelIndex &parent) const
     }
 
 	auto count = 0;
-	for (const auto &ptd : m_physical_terminal_data) {
+	for (const auto &ptd : m_edited_terminal_data) {
 		count += ptd.real_terminals_vector.size();
 	}
 
@@ -133,7 +133,14 @@ bool TerminalStripModel::setData(const QModelIndex &index, const QVariant &value
 	int modified_cell = -1;
 	auto column_ = index.column();
 
-	if (column_ == LED_CELL &&
+	if (column_ == LEVEL_CELL &&
+		role == Qt::EditRole)
+	{
+		rtd.level_ = value.toInt();
+		modified_ = true;
+		modified_cell = LEVEL_CELL;
+	}
+	else if (column_ == LED_CELL &&
 		role == Qt::CheckStateRole)
 	{
 			rtd.led_ = value.toBool();
@@ -180,6 +187,7 @@ bool TerminalStripModel::setData(const QModelIndex &index, const QVariant &value
 			vector_.replace(modified_cell, true);
 			m_modified_cell.insert(rtd.element_, vector_);
 		}
+		emit dataChanged(index, index);
 		return true;
 	}
 
@@ -226,18 +234,25 @@ Qt::ItemFlags TerminalStripModel::flags(const QModelIndex &index) const
 
 /**
  * @brief TerminalStripModel::modifiedRealTerminalData
- * @return the modified real terminal data
+ * @return a vector of QPair of modified terminal.
+ * the first value of the QPair is the original data, the second value is the edited data
  */
-QVector<RealTerminalData> TerminalStripModel::modifiedRealTerminalData() const
+QVector<QPair<RealTerminalData, RealTerminalData>> TerminalStripModel::modifiedRealTerminalData() const
 {
-	QVector<RealTerminalData> returned_vector;
+	QVector<QPair<RealTerminalData, RealTerminalData>> returned_vector;
 
 	const auto modified_real_terminal = m_modified_cell.keys();
 
-	for (const auto &ptd : m_physical_terminal_data) {
-		for (const auto &rtd : ptd.real_terminals_vector) {
-			if (modified_real_terminal.contains(rtd.element_)) {
-				returned_vector.append(rtd);
+	for (auto i = 0 ; i<m_edited_terminal_data.size() ; ++i)
+	{
+		auto ptd_ = m_edited_terminal_data.at(i);
+		for (auto j = 0 ; j < ptd_.real_terminals_vector.size() ; ++j)
+		{
+			auto rtd_ = ptd_.real_terminals_vector.at(j);
+			if (modified_real_terminal.contains(rtd_.element_))
+			{
+				returned_vector.append(qMakePair(m_original_terminal_data.at(i).real_terminals_vector.at(j),
+												 m_edited_terminal_data.at(i).real_terminals_vector.at(j)));
 			}
 		}
 	}
@@ -329,13 +344,14 @@ QVector<RealTerminalData> TerminalStripModel::realTerminalDataForIndex(QModelInd
 	return vector_;
 }
 
-void TerminalStripModel::fillRealTerminalData()
+void TerminalStripModel::fillPhysicalTerminalData()
 {
 		//Get all physical terminal
 	if (m_terminal_strip) {
 		for (auto i=0 ; i < m_terminal_strip->physicalTerminalCount() ; ++i) {
-			m_physical_terminal_data.append(m_terminal_strip->physicalTerminalData(i));
+			m_original_terminal_data.append(m_terminal_strip->physicalTerminalData(i));
 		}
+		m_edited_terminal_data = m_original_terminal_data;
 	}
 }
 
@@ -347,7 +363,7 @@ RealTerminalData TerminalStripModel::dataAtRow(int row) const
 	else
 	{
 		auto current_row = 0;
-		for (const auto &physical_data : m_physical_terminal_data)
+		for (const auto &physical_data : m_edited_terminal_data)
 		{
 			for (const auto &real_data : physical_data.real_terminals_vector)
 			{
@@ -379,15 +395,15 @@ void TerminalStripModel::replaceDataAtRow(RealTerminalData data, int row)
 		auto current_row = 0;
 		auto current_physical = 0;
 
-		for (const auto &physical_data : qAsConst(m_physical_terminal_data))
+		for (const auto &physical_data : qAsConst(m_edited_terminal_data))
 		{
 			auto current_real = 0;
 			for (int i=0 ; i<physical_data.real_terminals_vector.count() ; ++i)
 			{
 				if (current_row == row) {
-					auto physical_data = m_physical_terminal_data.at(current_physical);
+					auto physical_data = m_edited_terminal_data.at(current_physical);
 					physical_data.real_terminals_vector.replace(current_real, data);
-					m_physical_terminal_data.replace(current_physical, physical_data);
+					m_edited_terminal_data.replace(current_physical, physical_data);
 					return;
 				} else {
 					++current_real;
@@ -410,7 +426,7 @@ void TerminalStripModel::replaceDataAtRow(RealTerminalData data, int row)
  */
 PhysicalTerminalData TerminalStripModel::physicalDataAtIndex(int index) const
 {
-	if (m_physical_terminal_data.isEmpty()) {
+	if (m_edited_terminal_data.isEmpty()) {
 		return PhysicalTerminalData();
 	}
 
@@ -418,7 +434,7 @@ PhysicalTerminalData TerminalStripModel::physicalDataAtIndex(int index) const
 	int current_phy = -1;
 	bool match_ = false;
 
-	for (const auto &ptd_ : qAsConst(m_physical_terminal_data))
+	for (const auto &ptd_ : qAsConst(m_edited_terminal_data))
 	{
 		current_checked_index += ptd_.real_terminals_vector.size();
 		++current_phy;
@@ -430,7 +446,7 @@ PhysicalTerminalData TerminalStripModel::physicalDataAtIndex(int index) const
 	}
 
 	if (match_) {
-		return  m_physical_terminal_data.at(current_phy);
+		return  m_edited_terminal_data.at(current_phy);
 	} else {
 		return PhysicalTerminalData();
 	}
@@ -443,13 +459,13 @@ PhysicalTerminalData TerminalStripModel::physicalDataAtIndex(int index) const
  */
 RealTerminalData TerminalStripModel::realDataAtIndex(int index) const
 {
-	if (m_physical_terminal_data.isEmpty()) {
+	if (m_edited_terminal_data.isEmpty()) {
 		return RealTerminalData();
 	}
 
 	int current_checked_index = -1;
 
-	for (const auto & ptd_ : qAsConst(m_physical_terminal_data))
+	for (const auto & ptd_ : qAsConst(m_edited_terminal_data))
 	{
 		for (const auto & rtd_ : qAsConst(ptd_.real_terminals_vector)) {
 			++current_checked_index;
diff --git a/sources/TerminalStrip/ui/terminalstripmodel.h b/sources/TerminalStrip/ui/terminalstripmodel.h
index b29a50fdc..25a06a057 100644
--- a/sources/TerminalStrip/ui/terminalstripmodel.h
+++ b/sources/TerminalStrip/ui/terminalstripmodel.h
@@ -22,6 +22,7 @@
 #include <QObject>
 #include <QPointer>
 #include <QStyledItemDelegate>
+#include <QPair>
 
 #include "../terminalstrip.h"
 
@@ -40,14 +41,14 @@ class TerminalStripModel : public QAbstractTableModel
 		virtual QVariant headerData (int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
 		virtual Qt::ItemFlags flags (const QModelIndex &index) const override;
 
-		QVector<RealTerminalData> modifiedRealTerminalData() const;
+		QVector<QPair<RealTerminalData, RealTerminalData>> modifiedRealTerminalData() const;
 
 		bool isXrefCell(const QModelIndex &index, Element **element = nullptr);
 		QVector<PhysicalTerminalData> physicalTerminalDataForIndex(QModelIndexList index_list) const;
 		QVector<RealTerminalData> realTerminalDataForIndex(QModelIndexList index_list) const;
 
 	private:
-		void fillRealTerminalData();
+		void fillPhysicalTerminalData();
 		RealTerminalData dataAtRow(int row) const;
 		void replaceDataAtRow(RealTerminalData data, int row);
 		PhysicalTerminalData physicalDataAtIndex(int index) const;
@@ -55,7 +56,7 @@ class TerminalStripModel : public QAbstractTableModel
 
     private:
         QPointer<TerminalStrip> m_terminal_strip;
-		QVector<PhysicalTerminalData> m_physical_terminal_data;
+		QVector<PhysicalTerminalData> m_edited_terminal_data, m_original_terminal_data;
 		QHash<Element *, QVector<bool>> m_modified_cell;
 };
 
diff --git a/sources/undocommand/changeelementdatacommand.cpp b/sources/undocommand/changeelementdatacommand.cpp
index ca70809f5..a3f5fc043 100644
--- a/sources/undocommand/changeelementdatacommand.cpp
+++ b/sources/undocommand/changeelementdatacommand.cpp
@@ -18,7 +18,8 @@
 #include "changeelementdatacommand.h"
 #include "../qetgraphicsitem/element.h"
 
-ChangeElementDataCommand::ChangeElementDataCommand(Element *element, ElementData new_data) :
+ChangeElementDataCommand::ChangeElementDataCommand(Element *element, ElementData new_data, QUndoCommand *parent) :
+	QUndoCommand(parent),
     m_element(element),
     m_old_data(element->elementData()),
     m_new_data(new_data)
diff --git a/sources/undocommand/changeelementdatacommand.h b/sources/undocommand/changeelementdatacommand.h
index ecc4c590f..fe8526d75 100644
--- a/sources/undocommand/changeelementdatacommand.h
+++ b/sources/undocommand/changeelementdatacommand.h
@@ -26,7 +26,7 @@ class Element;
 class ChangeElementDataCommand : public QUndoCommand
 {
     public:
-        ChangeElementDataCommand(Element *element, ElementData new_data);
+		ChangeElementDataCommand(Element *element, ElementData new_data, QUndoCommand *parent = nullptr);
         void undo() override;
         void redo() override;