The module depends on the pos_pin module. Before POS order validation the module checks whether the order contains products with no positive quantity. If it does then a cashier gets popup to select users. A sale is take place if the selected user has group which is specified in the POS config parameter "Negative Order Group". Otherwise the sale is rejected.
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Demo: http://runbot.it-projects.info/demo/pos_addons/12.0
HTML Description: https://apps.odoo.com/apps/modules/12.0/pos_product_available_negative/
Usage instructions: doc/index.rst
Changelog: doc/changelog.rst
Notifications on updates: via Atom, by Email
Tested on Odoo 12.0 53dcdd5a9e22429a9638f68674264436ce21e42b