Bug 155478 [regression]Numbers in cascading group displays incorrectly
Description: Numbers in cascading group displays incorrectly. Steps to reproduce: 1. New sample data source and dataset from table ORDERS. 2. New a cascading group with two sub parameters, the first is from STATUS and the second is from ORDERNUMBER. 3. Preview 4. Select a status value in poped up parameter dialog, see ordernumber list Expected result: See 10100, 10101, such kind of format. Actual result: I saw 10.100, 10.167..., I just listed out the numbers as example
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/util/ParameterValidationUtil.java
*            the locale information
	 * @return the date value if validation is successful
	 * @throws ValidationValueException
	 *             if the value to validate is invalid
	 */
	static private Date doValidateDateTimeByPattern( String format,
			String value, ULocale locale ) throws ValidationValueException
	{
		assert !StringUtil.isBlank( format );
		if ( DesignChoiceConstants.DATETIEM_FORMAT_TYPE_UNFORMATTED
				.equalsIgnoreCase( format ) )
			return doVidateDateTime( value, locale );
		if ( StringUtil.isBlank( value ) )
			return null;
		try
		{
			DateFormatter formatter = new DateFormatter( locale );
			formatter.applyPattern( format );
			return formatter.parse( value );
		}
		catch ( ParseException e )
		{
			throw new ValidationValueException( value,
					PropertyValueException.DESIGN_EXCEPTION_INVALID_VALUE,
					DesignChoiceConstants.PARAM_TYPE_DATETIME );
		}
	}
	/**
	 * Validates the input date time string with the given format.
	 *