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
updateFormatField( );
				updateMessageLine( );
			}
		} );
	}
	private void createPromptLine( Composite parent )
	{
		promptMessageLine = new Label( parent, SWT.NONE );
		promptMessageLine.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
	}
	protected void okPressed( )
	{
		try
		{
			
			inputParameter.setName( nameEditor.getText( ) );
			inputParameter.setPromptText( UIUtil.convertToModelString( promptTextEditor.getText( ),
					true ) );
			String newControlType = getSelectedControlType( );
			if ( PARAM_CONTROL_COMBO.equals( newControlType ) )
			{
				newControlType = DesignChoiceConstants.PARAM_CONTROL_LIST_BOX;
				inputParameter.setMustMatch( true );
			}
			else if ( PARAM_CONTROL_LIST.equals( newControlType ) )
			{
				newControlType = DesignChoiceConstants.PARAM_CONTROL_LIST_BOX;
				inputParameter.setMustMatch( false );
			}
			else