Bug 118644 Hint for Date Time Parameters
The hint you give for date time parameters (Please enter date ... pattern: MM/DD/YYYY ....) is only true if the date is unformatted. If you apply a format, you must enter it according to it. So it's quite confusing!
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
{
						if ( !containValue( null, importValues[i], COLUMN_VALUE ) )
						{
							SelectionChoice choice = StructureFactory.createSelectionChoice( );
							choice.setValue( importValues[i] );
							choiceList.add( choice );
						}
					}
					refreshValueTable( );
				}
			}
		} );
		changeDefault = new Button( buttonBar, SWT.TOGGLE );
		changeDefault.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent e )
			{
				SelectionChoice choice = (SelectionChoice) ( (IStructuredSelection) valueTable.getSelection( ) ).getFirstElement( );
				if ( isDefaultChoice( choice ) )
				{
					defaultValue = null;
				}
				else
				{
					defaultValue = choice.getValue( );
				}
				refreshValueTable( );
				updateMessageLine( );
				updateButtons( );
			}
		} );