Force combination was added

Infrastructure/UI/Converters/Units/PlainDouble.cs

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+using StructureHelperCommon.Infrastructures.Exceptions;
+using StructureHelperCommon.Infrastructures.Strings;
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Data;
+
+namespace StructureHelper.Infrastructure.UI.Converters.Units
+{
+    internal class PlainDouble : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            try
+            {
+                return (double)value;
+            }
+            catch(Exception)
+            {
+                return new StructureHelperException(ErrorStrings.DataIsInCorrect);
+            }
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            try
+            {
+                return CommonOperation.ConvertToDoubleChangeComma((string)value);
+            }
+            catch (Exception)
+            {
+                return new StructureHelperException(ErrorStrings.DataIsInCorrect);
+            }
+        }
+    }
+}