Bug 205400 error displaying parameter in a table
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/validators/DataColumnNameValidator.java
DesignElement target, String columnBindingName )
	{
		DesignElement tmpElement = BoundDataColumnUtil
				.findTargetOfBoundColumns( target, module );
		if ( tmpElement instanceof GroupElement )
		{
			tmpElement = tmpElement.getContainer( );
			List columns = (List) tmpElement.getProperty( module,
					IReportItemModel.BOUND_DATA_COLUMNS_PROP );
			if ( exists( columns, columnBindingName ) )
				return true;
		}
		else
		{
			List columns = (List) tmpElement.getProperty( module,
					IReportItemModel.BOUND_DATA_COLUMNS_PROP );
			if ( exists( columns, columnBindingName ) )
				return true;
		}
		return false;
	}
	/**
	 * Tests whether the given expression has corresponding column binding in
	 * the given list.
	 * 
	 * @param columns
	 *            the binding columns
	 * @param columnName
	 *            the old value expression in BIRT 2.1M5
	 * @return <code>true</code> if the expression exists in the columns.