Bug 191685 [regression]Set default value doesn't work in Report Parameter[0705]
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
private String validateName( )
	{
		String name = nameEditor.getText( ).trim( );
		if ( name.length( ) == 0 )
		{
			return ERROR_MSG_NAME_IS_EMPTY;
		}
		if ( !name.equals( inputParameter.getName( ) )
				&& inputParameter.getModuleHandle( ).findParameter( name ) != null )
		{
			return ERROR_MSG_DUPLICATED_NAME;
		}
		if ( DesignChoiceConstants.PARAM_TYPE_DATETIME.equals( getSelectedDataType( ) ) )
		{
			if ( defaultValueChooser != null
					&& ( !defaultValueChooser.isDisposed( ) )
					&& defaultValueChooser.getText( ).length( ) != 0 )
			{
				try
				{
					getValue( defaultValueChooser.getText( ) );
				}
				catch ( BirtException e )
				{
					return ERROR_MSG_MISMATCH_DATA_TYPE;
				}
			}
		}
		return null;
	}