diff --git a/src/Paillave.EntityFrameworkCoreExtension/Paillave.EntityFrameworkCoreExtension.csproj b/src/Paillave.EntityFrameworkCoreExtension/Paillave.EntityFrameworkCoreExtension.csproj
index f7ba086f..c837364a 100644
--- a/src/Paillave.EntityFrameworkCoreExtension/Paillave.EntityFrameworkCoreExtension.csproj
+++ b/src/Paillave.EntityFrameworkCoreExtension/Paillave.EntityFrameworkCoreExtension.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.EntityFrameworkCoreExtension</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
diff --git a/src/Paillave.Etl.Autofac/Paillave.Etl.Autofac.csproj b/src/Paillave.Etl.Autofac/Paillave.Etl.Autofac.csproj
index 53e8fdc1..0db33086 100644
--- a/src/Paillave.Etl.Autofac/Paillave.Etl.Autofac.csproj
+++ b/src/Paillave.Etl.Autofac/Paillave.Etl.Autofac.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.EtlNet.Autofac</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
diff --git a/src/Paillave.Etl.Bloomberg/Paillave.Etl.Bloomberg.csproj b/src/Paillave.Etl.Bloomberg/Paillave.Etl.Bloomberg.csproj
index 82065cef..d46dc12a 100644
--- a/src/Paillave.Etl.Bloomberg/Paillave.Etl.Bloomberg.csproj
+++ b/src/Paillave.Etl.Bloomberg/Paillave.Etl.Bloomberg.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.EtlNet.Bloomberg</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
diff --git a/src/Paillave.Etl.Dropbox/Paillave.Etl.Dropbox.csproj b/src/Paillave.Etl.Dropbox/Paillave.Etl.Dropbox.csproj
index 6e87370d..aa4d00ab 100644
--- a/src/Paillave.Etl.Dropbox/Paillave.Etl.Dropbox.csproj
+++ b/src/Paillave.Etl.Dropbox/Paillave.Etl.Dropbox.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.EtlNet.Dropbox</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
diff --git a/src/Paillave.Etl.EntityFrameworkCore/Paillave.Etl.EntityFrameworkCore.csproj b/src/Paillave.Etl.EntityFrameworkCore/Paillave.Etl.EntityFrameworkCore.csproj
index 5b2771fd..0f16fdc9 100644
--- a/src/Paillave.Etl.EntityFrameworkCore/Paillave.Etl.EntityFrameworkCore.csproj
+++ b/src/Paillave.Etl.EntityFrameworkCore/Paillave.Etl.EntityFrameworkCore.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.EtlNet.EntityFrameworkCore</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
diff --git a/src/Paillave.Etl.ExcelFile/Paillave.Etl.ExcelFile.csproj b/src/Paillave.Etl.ExcelFile/Paillave.Etl.ExcelFile.csproj
index e5a76410..f1f45609 100644
--- a/src/Paillave.Etl.ExcelFile/Paillave.Etl.ExcelFile.csproj
+++ b/src/Paillave.Etl.ExcelFile/Paillave.Etl.ExcelFile.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.EtlNet.ExcelFile</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
diff --git a/src/Paillave.Etl.ExecutionToolkit/Paillave.Etl.ExecutionToolkit.csproj b/src/Paillave.Etl.ExecutionToolkit/Paillave.Etl.ExecutionToolkit.csproj
index efb3c61e..6a7f497b 100644
--- a/src/Paillave.Etl.ExecutionToolkit/Paillave.Etl.ExecutionToolkit.csproj
+++ b/src/Paillave.Etl.ExecutionToolkit/Paillave.Etl.ExecutionToolkit.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.EtlNet.ExecutionToolkit</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
diff --git a/src/Paillave.Etl.FileSystem/Paillave.Etl.FileSystem.csproj b/src/Paillave.Etl.FileSystem/Paillave.Etl.FileSystem.csproj
index 8bd149f6..e95dab06 100644
--- a/src/Paillave.Etl.FileSystem/Paillave.Etl.FileSystem.csproj
+++ b/src/Paillave.Etl.FileSystem/Paillave.Etl.FileSystem.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.EtlNet.FileSystem</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
diff --git a/src/Paillave.Etl.FromConfigurationConnectors/Paillave.Etl.FromConfigurationConnectors.csproj b/src/Paillave.Etl.FromConfigurationConnectors/Paillave.Etl.FromConfigurationConnectors.csproj
index 5f962207..989307d5 100644
--- a/src/Paillave.Etl.FromConfigurationConnectors/Paillave.Etl.FromConfigurationConnectors.csproj
+++ b/src/Paillave.Etl.FromConfigurationConnectors/Paillave.Etl.FromConfigurationConnectors.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.EtlNet.FromConfigurationConnectors</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
diff --git a/src/Paillave.Etl.Ftp/Paillave.Etl.Ftp.csproj b/src/Paillave.Etl.Ftp/Paillave.Etl.Ftp.csproj
index 3cb6bc05..e6a2168e 100644
--- a/src/Paillave.Etl.Ftp/Paillave.Etl.Ftp.csproj
+++ b/src/Paillave.Etl.Ftp/Paillave.Etl.Ftp.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.EtlNet.Ftp</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
diff --git a/src/Paillave.Etl.GraphApi/Paillave.Etl.GraphApi.csproj b/src/Paillave.Etl.GraphApi/Paillave.Etl.GraphApi.csproj
index 6efef186..574ba874 100644
--- a/src/Paillave.Etl.GraphApi/Paillave.Etl.GraphApi.csproj
+++ b/src/Paillave.Etl.GraphApi/Paillave.Etl.GraphApi.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.EtlNet.GraphApi</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
diff --git a/src/Paillave.Etl.Mail/Paillave.Etl.Mail.csproj b/src/Paillave.Etl.Mail/Paillave.Etl.Mail.csproj
index f91ac3d1..48d0d67d 100644
--- a/src/Paillave.Etl.Mail/Paillave.Etl.Mail.csproj
+++ b/src/Paillave.Etl.Mail/Paillave.Etl.Mail.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.EtlNet.Mail</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
diff --git a/src/Paillave.Etl.Pdf/Paillave.Etl.Pdf.csproj b/src/Paillave.Etl.Pdf/Paillave.Etl.Pdf.csproj
index 5a3d7352..352565a7 100644
--- a/src/Paillave.Etl.Pdf/Paillave.Etl.Pdf.csproj
+++ b/src/Paillave.Etl.Pdf/Paillave.Etl.Pdf.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.EtlNet.Pdf</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
diff --git a/src/Paillave.Etl.Sftp/Paillave.Etl.Sftp.csproj b/src/Paillave.Etl.Sftp/Paillave.Etl.Sftp.csproj
index c7847032..a65878f9 100644
--- a/src/Paillave.Etl.Sftp/Paillave.Etl.Sftp.csproj
+++ b/src/Paillave.Etl.Sftp/Paillave.Etl.Sftp.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.EtlNet.Sftp</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
diff --git a/src/Paillave.Etl.SqlServer/Paillave.Etl.SqlServer.csproj b/src/Paillave.Etl.SqlServer/Paillave.Etl.SqlServer.csproj
index b5440138..4c503b82 100644
--- a/src/Paillave.Etl.SqlServer/Paillave.Etl.SqlServer.csproj
+++ b/src/Paillave.Etl.SqlServer/Paillave.Etl.SqlServer.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.EtlNet.SqlServer</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
diff --git a/src/Paillave.Etl.TextFile/FlatFileDefinition.cs b/src/Paillave.Etl.TextFile/FlatFileDefinition.cs
index 4272d7bc..b8bce809 100644
--- a/src/Paillave.Etl.TextFile/FlatFileDefinition.cs
+++ b/src/Paillave.Etl.TextFile/FlatFileDefinition.cs
@@ -72,7 +72,10 @@ public FlatFileDefinition<T> WithMap(Expression<Func<IFieldMapper, T>> expressio
             }
             if (vis.MappingSetters.Any(i => i.Size.HasValue))
             {
-                if (!vis.MappingSetters.All(i => i.Size.HasValue)) throw new InvalidOperationException("if a size is given, all sizes must be given");
+                if (!vis.MappingSetters.All(i => i.Size.HasValue))
+                    throw new InvalidOperationException(
+                        $"if a size is given, all sizes must be given: missing size for columns with indexes: {string.Join(", ", vis.MappingSetters.Where(i => !i.Size.HasValue).Select(i => i.ColumnIndex))}.");
+
                 this.HasFixedColumnWidth(vis.MappingSetters.OrderBy(i => i.ColumnIndex).Select(i => i.Size.Value).ToArray());
             }
             return this;
diff --git a/src/Paillave.Etl.TextFile/Paillave.Etl.TextFile.csproj b/src/Paillave.Etl.TextFile/Paillave.Etl.TextFile.csproj
index 18fba3b5..89e522a5 100644
--- a/src/Paillave.Etl.TextFile/Paillave.Etl.TextFile.csproj
+++ b/src/Paillave.Etl.TextFile/Paillave.Etl.TextFile.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.EtlNet.TextFile</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
diff --git a/src/Paillave.Etl.XmlFile/Paillave.Etl.XmlFile.csproj b/src/Paillave.Etl.XmlFile/Paillave.Etl.XmlFile.csproj
index e2fca4da..516989e6 100644
--- a/src/Paillave.Etl.XmlFile/Paillave.Etl.XmlFile.csproj
+++ b/src/Paillave.Etl.XmlFile/Paillave.Etl.XmlFile.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.EtlNet.XmlFile</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
diff --git a/src/Paillave.Etl.Zip/Paillave.Etl.Zip.csproj b/src/Paillave.Etl.Zip/Paillave.Etl.Zip.csproj
index a0e9a228..68a12539 100644
--- a/src/Paillave.Etl.Zip/Paillave.Etl.Zip.csproj
+++ b/src/Paillave.Etl.Zip/Paillave.Etl.Zip.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.EtlNet.Zip</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
diff --git a/src/Paillave.Etl/Core/Mapping/Visitors/DummyFieldMapper.cs b/src/Paillave.Etl/Core/Mapping/Visitors/DummyFieldMapper.cs
index b5693ec0..d3cf3a00 100644
--- a/src/Paillave.Etl/Core/Mapping/Visitors/DummyFieldMapper.cs
+++ b/src/Paillave.Etl/Core/Mapping/Visitors/DummyFieldMapper.cs
@@ -94,6 +94,7 @@ public T ToNumberColumn<T>(int columnIndex, int size, string decimalSeparator, s
             this.MappingSetter.DecimalSeparator = decimalSeparator;
             this.MappingSetter.GroupSeparator = groupSeparator;
             this.MappingSetter.ColumnIndex = columnIndex;
+            this.MappingSetter.Size = size;
             return default;
         }
 
@@ -118,6 +119,7 @@ public T ToNumberColumn<T>(int columnIndex, int size, string decimalSeparator)
             this.MappingSetter.DecimalSeparator = decimalSeparator;
             this.MappingSetter.GroupSeparator = null;
             this.MappingSetter.ColumnIndex = columnIndex;
+            this.MappingSetter.Size = size;
             return default;
         }
         #endregion
diff --git a/src/Paillave.Etl/Paillave.Etl.csproj b/src/Paillave.Etl/Paillave.Etl.csproj
index 2134eb18..8bb20433 100644
--- a/src/Paillave.Etl/Paillave.Etl.csproj
+++ b/src/Paillave.Etl/Paillave.Etl.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.EtlNet.Core</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
diff --git a/src/Paillave.Pdf/Paillave.Pdf.csproj b/src/Paillave.Pdf/Paillave.Pdf.csproj
index e3780348..b77a95aa 100644
--- a/src/Paillave.Pdf/Paillave.Pdf.csproj
+++ b/src/Paillave.Pdf/Paillave.Pdf.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <PackageId>Paillave.Pdf</PackageId>
-    <Version>2.1.16-beta</Version>
+    <Version>2.1.17-beta</Version>
     <Authors>Stéphane Royer</Authors>
     <Company></Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>