Bug 176457 Use container's column bindings in chart editor
chart/org.eclipse.birt.chart.reportitem.ui/src/org/eclipse/birt/chart/reportitem/ui/ReportDataServiceProvider.java
{
			ComputedColumnHandle cc = (ComputedColumnHandle) iterator.next( );
			if ( ChartUIUtil.getExpressionString( cc.getName( ) )
					.equals( expression ) )
			{
				String dataType = cc.getDataType( );
				if (  dataType.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_STRING ) )
				{
					return DataType.TEXT_LITERAL;
				}
				else if ( dataType.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_DECIMAL )
						|| dataType.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_FLOAT )
						|| dataType.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_INTEGER )
						|| dataType.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_BOOLEAN ) )
				{
					return DataType.NUMERIC_LITERAL;
				}
				else if ( dataType.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_DATETIME ) )
				{
					return DataType.DATE_TIME_LITERAL;
				}
				else if ( dataType.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_ANY ) )
				{
					return null;
				}
			}
		}
		return null;		
	}
}