This feature is native in the purchase module in v14. I consider that it
replaces the 3 modules service_line_qty_update_base/service_line_qty_update_purchase/service_line_qty_update_sale
The same ir.config_parameter is used in:
- purchase_usability for purchase.order.line
- sale_usability for sale.order.line
- account_usability for account.move.line