I created a new product in odoo 15 enterprise demo. I assigned serial numbers to it during my purchase. I enabled 'Available in POS' option because I want to sell it in my shop. No matter what I do, I can only create new serial numbers in the POS. I want the existing serial numbers to be shown in my POS. I tried enabling only Use Existing Lots/Serial Numbers in the Warehouse operation types and even then I'm still getting this problem. What should I do to see the existing lots and serial numbers in the POS module ?