QB Issue Resolution:

You’re seeing an unresolved bug. This has been broken since QB 2015 shipped, and Intuit hasn’t fix it yet.

Resolution for Issue 'Adding a text line on the invoice body, without it displaying $0.00.' available: Yes (Solved).
Source: Intuit Community forum.

Adding a text line on the invoice body, without it displaying $0.00.: this 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 issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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