Bug 146796 Error message pop up if display text contain non-digital char when add next item
Description: In decimal type parameter creation,display type is "list box", Error message pop up if "display text" contain non-digital char when add next item. Steps: 1.Create a new decimal parameter 2.Set display type as "list box" 3.Input one item: value:1, display text:test 4.Input another item: Value:2 Actual result: error message pop up: The display text already exists! Expected result: Input item succussfully.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
public void widgetSelected( SelectionEvent e )
			{
				String type = getSelectedDataType( );
				ImportValueDialog dialog = new ImportValueDialog( type );
				if ( dialog.open( ) == OK )
				{
					String[] importValues = (String[]) dialog.getResult( );
					for ( int i = 0; i < importValues.length; i++ )
					{
						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