ISSUE:

We are facing one issue with the Simple Details on Configurable Products extension: The "Add to Cart" button does not work for some attributes even when the child products are still in stock (salable qty >0)


SOLUTION:

It seems that there is an incompatible issue with MSI for child products. 


To resolve the issue, please edit the file: app/code/Bss/Simpledetailconfigurable/Helper/ProductData.php as below (please note that the fix can only work with the site enabling MSI):



Or download the file attached below to override the current file on your site.


If you need any further assistance, please feel free to contact us. We'd be happy to support you!