diff --git a/Signum.Engine/Schema/Schema.Basics.cs b/Signum.Engine/Schema/Schema.Basics.cs
index 8cfe99ccfe..3700bd5505 100644
--- a/Signum.Engine/Schema/Schema.Basics.cs
+++ b/Signum.Engine/Schema/Schema.Basics.cs
@@ -512,7 +512,7 @@ public partial class FieldPrimaryKey : Field, IColumn
         bool IColumn.PrimaryKey { get { return true; } }
         public bool Identity { get; set; }
         bool IColumn.IdentityBehaviour { get { return table.IdentityBehaviour; } }
-        int? IColumn.Size { get { return null; } }
+        public int? Size { get; set; }
         int? IColumn.Scale { get { return null; } }
         public string? Collation { get; set; }
         Table? IColumn.ReferenceTable { get { return null; } }
@@ -840,7 +840,7 @@ public partial class FieldReference : Field, IColumn, IFieldReference
         public bool PrimaryKey { get; set; } //For View
         bool IColumn.Identity { get { return false; } }
         bool IColumn.IdentityBehaviour { get { return false; } }
-        int? IColumn.Size { get { return null; } }
+        int? IColumn.Size { get { return this.ReferenceTable.PrimaryKey.Size; } }
         int? IColumn.Scale { get { return null; } }
         public Table ReferenceTable { get; set; }
         Table? IColumn.ReferenceTable => ReferenceTable;
diff --git a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
index b437d402d6..b3270bbd47 100644
--- a/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
+++ b/Signum.Engine/Schema/SchemaBuilder/SchemaBuilder.cs
@@ -545,6 +545,7 @@ protected virtual Field GenerateFieldPrimaryKey(Table table, PropertyRoute route
                 UserDefinedTypeName = pair.UserDefinedTypeName,
                 Default = attr.GetDefault(Settings.IsPostgres),
                 Identity = attr.Identity,
+                Size = attr.HasSize ? attr.Size : (int?)null,
             };
         }