When do billing errors typically appear on a Sales Order?

Billing errors on a Sales Order can often occur when two users attempt to process or bill the same order simultaneously. This scenario can lead to conflicts in the data being processed, resulting in discrepancies such as duplicated invoices, incorrect amounts billed, or failure to update the system appropriately. The system may not be able to manage two simultaneous transactions effectively, causing errors to arise in the billing process.

The other situations listed, while they may have their own unique challenges, do not typically result in the same kind of conflict or simultaneous processing issue that leads to billing errors. For example, creating an invoice from an opportunity might highlight issues if there's a mistake in the original data, but it doesn't inherently create a billing error as two users working in parallel does. Editing an invoice generally allows for corrections to be made rather than presenting a simultaneous error situation, and copying an invoice is usually a straightforward action, assuming the original invoice was accurately created.