Bug 168026 Still use the existing data binding even though the aggregate is different
I had a table in which a data binding which aggregates on a group. When I insert a new data item in the report, although the expressions are same, it aggregates on All, then it refered to the existing data binding. The expected behavior would be a new data binding is created with different aggregates.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ScalarParameterHandle.java
public String getPattern( )
	{
		Object value = getProperty( FORMAT_PROP );
		if ( value == null )
			return null;
		assert value instanceof ParameterFormatValue;
		return ( (ParameterFormatValue) value ).getPattern( );
	}
	/**
	 * Returns the category for the parameter format. The format is used by the
	 * UI to display the value.
	 * 
	 * @return the category for the parameter format
	 */
	public String getCategory( )
	{
		Object value = getProperty( FORMAT_PROP );
		if ( value == null )
			return null;
		assert value instanceof ParameterFormatValue;
		return ( (ParameterFormatValue) value ).getCategory( );
	}
	/**
	 * Sets the format instructions for the parameter value. The format is used
	 * by the UI to display the value.
	 * 
	 * @param format
	 *            the format for the parameter value
	 * @throws SemanticException
	 *             if the property is locked.