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
*             if the input value is not valid with the given data type
	 */
	static private Object validate( String dataType, String value,
			ULocale locale ) throws ValidationValueException
	{
		if ( value == null )
			return null;
		if ( DesignChoiceConstants.PARAM_TYPE_DATETIME
				.equalsIgnoreCase( dataType ) )
			return doVidateDateTime( value, locale );
		else if ( DesignChoiceConstants.PARAM_TYPE_FLOAT
				.equalsIgnoreCase( dataType ) )
		{
			Number number = doValidateNumber( dataType, value, locale );
			if ( number == null )
				return null;
			return new Double( number.doubleValue( ) );
		}
		else if ( DesignChoiceConstants.PARAM_TYPE_DECIMAL
				.equalsIgnoreCase( dataType ) )
		{
			Number number = doValidateNumber( dataType, value, locale );
			if ( number == null )
				return null;
			return new BigDecimal( number.toString( ) );
		}
		else if ( DesignChoiceConstants.PARAM_TYPE_INTEGER
				.equalsIgnoreCase( dataType ) )
		{
			Number number = doValidateNumber( dataType, value, locale );