Bug 151535 Parameters are invisable in Joint Dataset
Trying to use "Joint Dataset" combined with parameters within underlaying Data-Sets (neccessary to achive a filtering where clause for a DateTime Field) Parameter editing ( e.g. in Chart designer) do not show the entire parameter. As specified it should show and let to edit a combination of both underlaying datasets' parameters.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/adapter/ModelDteApiAdapter.java
* 
	 * @param context
	 *            Context for event handlers. May be null
	 * @param jsScope
	 *            Scope for evaluting property binding expressions. If null,
	 *            property bindings have no effect
	 */
	public ModelDteApiAdapter( ExecutionContext context, Scriptable jsScope )
	{
		this.context = context;
		this.jsScope = jsScope;
	}
	/**
	 * Adapts the specified Model Data Source to a Data Engine API data source
	 * design object
	 */
	public IBaseDataSourceDesign createDataSourceDesign(
			DataSourceHandle dataSource ) throws BirtException
	{
		if ( dataSource instanceof OdaDataSourceHandle )
			return newOdaDataSource( ( OdaDataSourceHandle ) dataSource );
		if ( dataSource instanceof ScriptDataSourceHandle )
			return newScriptDataSource( ( ScriptDataSourceHandle ) dataSource );
		
		assert false;
		return null;
	}
	/**
	 * Adapts the specified Model Data Set to a Data Engine API data set design
	 * object