User is unable to see vendor names on invoices created by batch invoicing. Previously, the vendors would be listed in the Employee column in Invoice Details > Expense Details. How can this be fixed?

There might have been a change made in your Global Settings. To fix this, go to Global Settings > Invoice Templates screen and click Detail for the template you use. Next, click the 'Layout' drop-down and correct the 'Display Vendor As' field of both Time and Expense tabs. When you are done, click Save Changes.