This relates to OpenCart core, we are not allowed to touch in the core to fix this. Hope you understand.
If you want to solve this, you have to buy the module.
May 8, 2017 at 04:33 (6 months ago)
We have forwarded your request to the opencart core team.
Temporarily to solve this problem, we will help you update 1 more column in the cart page to display the status of the product in its quantity.
It helps customers know what products are available, Not available in desired quantity or not in stock.
If you want to modify the above please send information about Ftp, and backend for us
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