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
if ( inputParameter.getDataSetName( ) != null )
			{
				dataSetChooser.setText( inputParameter.getDataSetName( ) );
			}
			refreshColumns( false );
			String columnName = getColumnName( inputParameter.getValueExpr( ) );
			if ( columnName != null )
			{
				columnChooser.setText( columnName );
			}
			columnName = getColumnName( inputParameter.getLabelExpr( ) );
			if ( columnName != null )
			{
				displayTextChooser.setText( columnName );
			}
			if ( defaultValue != null )
			{
				defaultValueEditor.setText( defaultValue );
			}
		}
		updateMessageLine( );
	}
	private void initFormatField( )
	{
		if ( ( DesignChoiceConstants.PARAM_TYPE_DECIMAL.equals( lastControlType ) && DesignChoiceConstants.PARAM_TYPE_FLOAT.equals( getSelectedDataType( ) ) )
				|| ( DesignChoiceConstants.PARAM_TYPE_FLOAT.equals( lastControlType ) && DesignChoiceConstants.PARAM_TYPE_DECIMAL.equals( getSelectedDataType( ) ) ) )
		{
			return;
		}
		IChoiceSet choiceSet = getFormatChoiceSet( getSelectedDataType( ) );