Commerce 12.11.0
When I try to add a line item to an existing Order in Commerce Manager, I get the following error
The Product '' does not have a valid max quantity setting and was removed from your cart.
The variation has the Inventory Min and Max Quantity set to 0 and not Tracked.
Increasing the max quantity doesn't resolve the error.
The error only occurs in Commerce Manager, adding the same item to cart via the front end website works.