“The items that were on the invoice were in fact backordered. Are they supposed to show up as $0 in that case?”

You would not be charging them yet, so that is 0, for now.

The process of Fulfillment and Backorder means you show them what is fulfilled and that is charged […]

Resolution for 'backordered issue: 'What is the difference between the ‘Balance’, ‘Open Balance’ and ‘Amount’ columns in the reports?' available: Yes.

The backordered issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the backordered issue yourself by looking for a resolution described in the article. If it is a complex backordered issue or you are unable to solve the issue, you may contact us by clicking here or by using other backordered support options.

For more information about resolving issues related to backordered in Quickbooks/QBO or to get support for the issue 'What is the difference between the ‘Balance’, ‘Open Balance’ and ‘Amount’ columns in the reports?', click the link below: