Bug 153387 Database item can't be dragged and dropped onto editor field
Steps to reproduce: 1.Start up BIRT in Mac OS X; 2.File->New->Project; 3.File->New->Report Design; 4.In Data Explorer, create a New Data Source, and choose "Classic Models Inc. Sample DataBase", press "Next" and then press "finish"; 5.In Data Explorer, create a New Data Set, press "Next"; 6.In the popup window, expand the "CLASSICMODELS", select and drag a item onto the editor field at right side.
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/editors/SQLDataSetEditorPage.java
break;
				case DbType.PROCEDURE_TYPE:
					type = DbType.PROCEDURE_STRING;
					break;
			}
		}
		
		return type;
	}
	/**
	* @param item A tree Item which has to be tested
	* @return if the TreeItem represents a Schema node
	*/
	protected boolean isSchemaNode( TreeItem item )
	{
		if ( item != null && isSchemaSupported )
		{
			if (item.getParentItem() == rootNode)
			{
				return true;
			}
		}
		return false;
	}
	
	/**
	 * refresh page
	 * 
	 */
	private void refreshPage( )