When a POS cashier attempts to checkout a transaction and fails in Online mode due to a network disruption, they are allowed to manually or automatically switch to Offline mode and modify the cart in any ways (add/modify/void sales lines or tender lines) before attempting checkout again. This creates a potential issue, as it’s possible for the Online mode checkout to have succeeded before or during the switch to Offline mode, leading to inconsistent transaction data due to modifications made in Offline mode.