BI Publisher Choose/ Otherwise Statement in .rtf

I'm trying to use the following statement in my .rtf  (embedded BI Publisher) It appears to not like the    <?when:Quantity_Canceled_ID111>.01?>'Cancelled'<?end when?>   part of the code.

How would I go about writing this line so it's correct when I click Validate Template.

<?choose:?>

<?when:Quantity_Canceled_ID111>.01?>'Cancelled'<?end when?>

<?when:Description_of_Change_ID222='Quantity Change'?>'Quantity Change'<?end when?>

<?otherwise:?><?end otherwise?>

<?end choose?>

Thank you for any help you're able to provide.