QB Issue Resolution:

As mentioned, the IIF headers are predefined fields. Currently, you can only enter details on the available headers, and the option to add more is unavailable.


For additional details and references, I recommend checking the articles below:

I already sent a feedback statement on your behalf to our engineers. We listen to customers’ suggestions as it contributes significantly for product enhancements. You can always visit the QuickBooks Blog site to check the latest added feature.


Resolution for Issue 'iif file headers missing' available: Yes (Solved).
Source: Intuit Community forum.

iif file headers missing: 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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