Index: src/Deltares.DSoilModel.Forms/DSoilModelContext.cs
===================================================================
diff -u -r741 -r743
--- src/Deltares.DSoilModel.Forms/DSoilModelContext.cs	(.../DSoilModelContext.cs)	(revision 741)
+++ src/Deltares.DSoilModel.Forms/DSoilModelContext.cs	(.../DSoilModelContext.cs)	(revision 743)
@@ -485,6 +485,13 @@
         /// <returns></returns>
         public override string GetFormat(Type type, object source, string member)
         {
+            if (type == typeof(Soil) || source is Soil)
+            {
+                if (member == StaticReflection.GetMemberName<Soil>(x => x.PermeabKx))
+                {
+                    return "F10";
+                }
+            }
             if (type == typeof(ConePenetrationTestPerSegment) || source is ConePenetrationTestPerSegment)
             {
                 if (member == StaticReflection.GetMemberName<ConePenetrationTestPerSegment>(x => x.Xlocal))
Index: src/Deltares.DSoilModel.Forms.Tests/DSoilModelContextTest.cs
===================================================================
diff -u -r741 -r743
--- src/Deltares.DSoilModel.Forms.Tests/DSoilModelContextTest.cs	(.../DSoilModelContextTest.cs)	(revision 741)
+++ src/Deltares.DSoilModel.Forms.Tests/DSoilModelContextTest.cs	(.../DSoilModelContextTest.cs)	(revision 743)
@@ -321,6 +321,7 @@
         [TestCase(typeof(Boring), "AvailableEntities", "F3")]
         [TestCase(typeof(BoringLayer), "TopLevel", "F3")]
         [TestCase(typeof(BoringLayer), "BottomLevel", "F3")]
+        [TestCase(typeof(Soil), "PermeabKx", "F10")]
         public void DSoilModelContext_GetFormat(Type type, string member, string format)
         {
             var dSoilModelContext = SetupDSoilModelContext(null);