Bug 142462 Cannot create bindings for data set output parameters
Define a JDBC Stored Procedure data set with at least one data set output parameter. Bind this data set to a table. Edit data binding for the table and add a new binding. In the expression builder, under "Available Data Sets", only the columns for the data set are shown as available. The output parameters are not shown. This is a regression against 2.0. This bug makes data set parameters unusable.
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DEUtil.java
if ( StringUtil.isBlank( columnName ) )
		{
			return null;
		}
		return IReportElementConstants.RESULTSET_COLUMN_PREFIX
				+ "[\"" + DEUtil.escape( columnName ) + "\"]";
	}
	/**
	 * Relativizes the path against this base path.
	 * 
	 * @param basePath
	 *            the base path
	 * @param path
	 *            the path to convert
	 * @return The relative path based on the base path if it is possible, or
	 *         the original path
	 * 
	 */
	public static String getRelativedPath( String basePath, String path )
	{
		File baseFile = new File( basePath );
		if ( baseFile.isFile( ) )
		{
			baseFile = baseFile.getParentFile( );
		}
		return URIUtil.getRelativePath( baseFile.getAbsolutePath( ), path );
	}
	/**
	 * Returns the handle of the action of the given element.
	 *