Bug 146796 Error message pop up if display text contain non-digital char when add next item
Description: In decimal type parameter creation,display type is "list box", Error message pop up if "display text" contain non-digital char when add next item. Steps: 1.Create a new decimal parameter 2.Set display type as "list box" 3.Input one item: value:1, display text:test 4.Input another item: Value:2 Actual result: error message pop up: The display text already exists! Expected result: Input item succussfully.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
private static final String CHECKBOX_ALLOW_NULL = Messages.getString( "ParameterDialog.CheckBox.AllowNull" ); 
	private static final String CHECKBOX_ALLOW_BLANK = Messages.getString( "ParameterDialog.CheckBox.AllowBlank" ); 
	private static final String CHECKBOX_DO_NOT_ECHO = Messages.getString( "ParameterDialog.CheckBox.DoNotEchoInput" ); 
	private static final String CHECKBOX_SORT = Messages.getString( "ParameterDialog.CheckBox.Sort" ); 
	private static final String CHECKBOX_HIDDEN = Messages.getString( "ParameterDialog.CheckBox.Hidden" ); 
	private static final String BUTTON_LABEL_CHANGE_FORMAT = Messages.getString( "ParameterDialog.Button.ChangeFormat" ); 
	private static final String BUTTON_LABEL_IMPORT = Messages.getString( "ParameterDialog.Button.ImportValue" ); 
	private static final String BUTTON_LABEL_SET_DEFAULT = Messages.getString( "ParameterDialog.Button.SetDefault" ); 
	private static final String BUTTON_LABEL_REMOVE_DEFAULT = Messages.getString( "ParameterDialog.Button.RemoveDefault" ); 
	private static final String BUTTON_LABEL_DELETE = Messages.getString( "ParameterDialog.Button.Delete" ); 
	private static final String BUTTON_CREATE_DATA_SET = Messages.getString( "ParameterDialog.Button.CreateDataSet" ); 
	private static final String RADIO_DYNAMIC = Messages.getString( "ParameterDialog.Radio.Dynamic" ); 
	private static final String RADIO_STATIC = Messages.getString( "ParameterDialog.Radio.Static" ); 
	private static final String INPUT_PROPMT = Messages.getString( "ParameterDialog.Prompt.Input" ); 
	private static final String ERROR_TITLE_INVALID_INPUT = Messages.getString( "ParameterDialog.ErrorTitle.InvalidInput" ); 
	private static final String ERROR_TITLE_INVALID_LIST_LIMIT = Messages.getString( "ParameterDialog.ErrorTitle.InvalidListLimit" ); 
	private static final String ERROR_MSG_CANNOT_BE_BLANK = Messages.getString( "ParameterDialog.ErrorMessage.CanootBeBlank" ); 
	private static final String ERROR_MSG_CANNOT_BE_NULL = Messages.getString( "ParameterDialog.ErrorMessage.CanootBeNull" ); 
	private static final String ERROR_MSG_DUPLICATED_VALUE = Messages.getString( "ParameterDialog.ErrorMessage.DuplicatedValue" ); 
	private static final String ERROR_MSG_DUPLICATED_LABEL = Messages.getString( "ParameterDialog.ErrorMessage.DuplicatedLabel" ); 
	private static final String ERROR_MSG_MISMATCH_DATA_TYPE = Messages.getString( "ParameterDialog.ErrorMessage.MismatchDataType" ); 
	private static final String ERROR_MSG_DUPLICATED_NAME = Messages.getString( "ParameterDialog.ErrorMessage.DuplicatedName" ); 
	private static final String ERROR_MSG_NAME_IS_EMPTY = Messages.getString( "ParameterDialog.Errormessage.EmptyName" ); 
	private static final String ERROR_MSG_NO_DEFAULT_VALUE = Messages.getString( "ParameterDialog.ErrorMessage.NoDefaultValue" ); 
	private static final String ERROR_MSG_NO_AVAILABLE_COLUMN = Messages.getString( "ParameterDialog.ErrorMessage.NoAvailableColumn" ); 
	private static final String ERROR_MSG_INVALID_LIST_LIMIT = Messages.getString( "ParameterDialog.ErrorMessage.InvalidListLimit" ); 
	private static final String FLAG_DEFAULT = Messages.getString( "ParameterDialog.Flag.Default" ); 
	private static final String COLUMN_VALUE = Messages.getString( "ParameterDialog.Column.Value" ); 
	private static final String COLUMN_DISPLAY_TEXT = Messages.getString( "ParameterDialog.Column.DisplayText" ); 
	private static final String COLUMN_IS_DEFAULT = Messages.getString( "ParameterDialog.Column.Default" );