Unable to extend checkout product item in my plugin

I am stuck in very simple thing in my plugin where i am trying to extend checkout section but nothing happens and this issue only happend in checkout although i did extend detail section which works fine.Can you please figure out what i am doing wrong ?? here is the code snippets :

{extends file=“parent:frontend/checkout/items/product.tpl”}
{block name=‘frontend_checkout_cart_item_details’ }
   

     {block name=‘frontend_checkout_cart_item_details_comments’}
         
         testing

     {/block}
   

{/block}

Hi Emaan,

you are overwriting the whole block ‘frontend_checkout_cart_item_details’. Is this your intention? Or do want to extend this block? Then you have to use append or prepend. Have a look at our Dev Docs

Did you register your template dir in your plugin bootstrap file? You can find an example here

Best regards from Schöppingen

cool Michael Telgmann