diff --git a/tests/word/shortcuts/shortcuts.js b/tests/word/shortcuts/shortcuts.js
index 32ee50ed6b..57bb374e70 100644
--- a/tests/word/shortcuts/shortcuts.js
+++ b/tests/word/shortcuts/shortcuts.js
@@ -1322,8 +1322,10 @@
 			TurnOnRecalculate();
 			ClearDocumentAndAddParagraph('');
 			const complexForm = AddComplexForm();
+			AscTest.Recalculate();
+			assert.strictEqual(complexForm.GetLinesCount(), 1, "Check line count before adding line break");
 			ExecuteHotkey(testHotkeyActions.addBreakLineInlineLvlSdt);
-			assert.strictEqual(complexForm.Lines[0], 2, "Check add break line");
+			assert.strictEqual(complexForm.GetLinesCount(), 2, "Check line count after adding line break");
 			TurnOffRecalculate();
 		});
 
diff --git a/word/Editor/Document.js b/word/Editor/Document.js
index 15b71210c2..5e1c478c1f 100644
--- a/word/Editor/Document.js
+++ b/word/Editor/Document.js
@@ -9750,8 +9750,21 @@ CDocument.prototype.executeShortcut = function(type)
 		{
 			if (!this.IsSelectionLocked(AscCommon.changestype_Paragraph_Content, null, false, this.IsFormFieldEditing()))
 			{
+				let selectedInfo = this.GetSelectedElementsInfo();
+				let math = selectedInfo.GetMath();
+
 				this.StartAction(AscDFH.historydescription_Document_EnterButton);
-				this.AddToParagraph(new AscWord.CRunBreak(AscWord.break_Line));
+				if (math && math.Is_InInnerContent())
+				{
+					math.Handle_AddNewLine();
+					math.ProcessAutoCorrect();
+					// TODO: Implement case !math.Is_InInnerContent()
+				}
+				else
+				{
+					this.AddToParagraph(new AscWord.CRunBreak(AscWord.break_Line));
+				}
+				this.Recalculate();
 				this.FinalizeAction();
 				result = true;
 			}
@@ -11841,9 +11854,14 @@ CDocument.prototype.EndFormEditing = function()
 	if (oInlineSdt && oInlineSdt.IsForm())
 	{
 		if (oInlineSdt.IsFixedForm())
+		{
 			this.EndDrawingEditing();
+		}
 		else
+		{
+			this.RemoveSelection();
 			oInlineSdt.MoveCursorOutsideElement(true);
+		}
 
 		this.UpdateSelection();
 		this.UpdateInterface();
diff --git a/word/Editor/ParagraphContentBase.js b/word/Editor/ParagraphContentBase.js
index b5b846caaf..0e8f3d662e 100644
--- a/word/Editor/ParagraphContentBase.js
+++ b/word/Editor/ParagraphContentBase.js
@@ -56,6 +56,10 @@ CParagraphContentBase.prototype.GetLogicDocument = function()
 {
 	return this.Paragraph ? this.Paragraph.GetLogicDocument() : null;
 };
+CParagraphContentBase.prototype.GetLinesCount = function()
+{
+	return 0;
+};
 CParagraphContentBase.prototype.CanSplit = function()
 {
 	return false;
@@ -1062,6 +1066,10 @@ CParagraphContentWithContentBase.prototype.getRangePos = function(line, range)
 		this.protected_GetRangeEndPos(_line, _range),
 	];
 };
+CParagraphContentWithContentBase.prototype.GetLinesCount = function()
+{
+	return this.protected_GetLinesCount();
+};
 
 // Здесь предполагается, что строки с номерами меньше, чем LineIndex заданы, а также заданы и отрезки в строке 
 // LineIndex, с номерами меньшими, чем RangeIndex. В данной функции удаляются все записи, которые идут после LineIndex,