If a user is sent to the store via a punchout from an OCI enabled system, the quantities of products in the cart cannot be changed.
Create a user holding (only) oci_checkout rights. Enter the store vie the regular /user/login dialogue, shop to you heart's content, proceed to the cart, change quantities as needed, checkout -> all fine.
Getting sent to the site through a punchout, shop along, proceed to the cart -> changing of quantities not possible anymore.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
It's because of the CommerceOciCheckoutFormAlter::alterCart() function
Because it's unset in the unset($form["actions"]);
Im working on a patch that enables the "update cart" button.
And maybe, i i have time, make it a configuration settings, wheather that button should be visible or not.