Zend certified PHP/Magento developer

Error message “Some of the products are disabled” on checkout

I am facing a very strange error message on checkout level on our Magento 2.4.4 instance with products with quantity below 1.

When checking out only an article with 0.5 units I get an error message saying “Some of the products are disabled”

Error message: Some of the products are disabled

But those products are all disabled in all our store views.

For those products o.5 is the minimum quantity, as they are a material, which can be bought in units < 1 and also in decimal quantities.

In our store I have the MOQ set as 1 globally and then for selected SKUs via –> Catalog –> SKU XYZ = Update Attributes –> and then Minimum quantity = 0.5 and Quantity uses decimals = Yes

Minimum quantity = 0.5 and Quantity uses decimals

I can put the article with 0.5 into the shopping cart without problem.

But when I say “Proceed to checkout” only 1 article with 0.5 I get the error message as stated above.

Strangely when I put 2 articles with 0.5 into the cart, I can checkout without any problem.

Only quantity below 1 creates a problem.

Does anyone know how and where this error message can stem from, even if the products are enabled?