What is a possible reason for not seeing a recently attached expense in a project?

The reason for not seeing a recently attached expense in a project can be attributed to the line item being assigned to the customer instead of the project. In Xero, when expenses are logged, they must be specifically associated with the appropriate project to appear in the project's financials. If an expense is mistakenly assigned to a customer, it will not show up under the specific project being reviewed, even though it exists in the system. This highlights the importance of careful categorization and assignment during data entry to ensure expenses are accurately tracked within the intended projects.

The other options present scenarios that may or may not result in the same outcome. Permanently deleted expenses would not be visible at all, archived projects would not display any active expenses, and duplicated expenses can create confusion but would still generally appear in the system. Proper assignment is critical for visibility in project financial tracking.