IMinutesField Interface

try
 {
     Qdv.UserApi.Fields.IMinutesFieldManager fieldMan = es.GetMinutesFieldManager();
     Qdv.UserApi.Fields.IMinutesField field;
     if (!fieldMan.FieldExists("AAA"))
     {
         // Create a new field 'aaa'.
         field = fieldMan.AddField("AAA", "aaa");
        
         // Set the field properties. Not all combinations are allowed.
         // Some are commented out (with an explanation) for testing.
         field.Comment = "aaa comment";
         field.ConditionalFormula = "=1";
         field.CopyInsideGroup = true;
         field.CopyInsideSet = true;
         field.ColumnType = FieldColumnType.Numeric;
         //field.ColumnType = FieldColumnType.Text;
         field.DefaultValue = "10";
         field.DifferentiatorForArticles = true;
         field.FieldName = "Field aaa";   // this sets the name in the current QDV locale
         field.FieldNameMultilingual.SetText("Field aaa FR", "fr");
         field.FieldNameMultilingual.SetText("Field aaa EN", "en-us");
         field.ForNomenclaturesOnly = false;
         field.IgnoreFromDatabaseOfEstimate = true;
         field.ListBoxData = "aaa|bbb|ccc|[FreeInput]";
         //field.Formula = "=30";    // if this is set, many other properties cannot be set and throw an exception
         field.ParentName = "ccc";
         field.ParentNameMultilingual.SetText("ccc belgian", "Fr-be");
         field.PartOf = FieldIsPartOfKind.Costs;
         field.ProgressField = "";
         //field.ProgressStatement = 1;  // if this is set, many other properties cannot be set and throw an exception
         //field.ReplacementField = "repl";  // not available for free fields
         //field.EntryAllowed = FieldEntryAllowedView.WBSOnly;
         //field.SharedField = Not field.SharedField; // cannot be set if field.EntryAllowed = FieldEntryAllowedView.WBSOnly
         field.ReplaceWhenUpdating = FieldReplaceWhenUpdatingKind.WhenBlank; // cannot be set when Formula is defined
         field.ShowDefaultValue = true; // cannot be set when Formula is defined
         field.ShowInTotals = FieldShowInTotalsKind.ResultOfFormula; // cannot be set when Formula is defined
         field.ShowRowsGrouped = FieldShowRowsGroupedKind.SpecialFormula; // cannot be set when Formula is defined
         field.SpecialFormula = "=40"; // cannot be set when Formula is defined
         field.UniqueField = true; // cannot be set when Formula is defined
         field.VisibleInEstimate = false;
         field.VisibleInProgress = false;
         //field.EntryAllowed = FieldEntryAllowedView.MinutesAndNomenclatures;
         field.Allowed = FieldAllowedView.MinutesAndNomenclatures;    //ignored and set to Minutes only if ProgressField or ProgressStatement properties are set
         //field.ColumnType = FieldColumnType.WordDocument;
     }
     else {
         field = fieldMan.GetField("AAA");
         field.Formula = "=IF([WPU] <> 0 , 2, 0)";
     }
     fieldMan.ApplyChanges();
 }
 catch (Exception ex)
 {
     MessageBox.Show(ex.ToString());
 }