QB Issue Resolution:

you’re able to figure out and define the fields in QuickBooks Desktop (QBDT). For your future reference, you can also check this article: Use QuickBooks Desktop custom fields.

 

Resolution for Issue 'Custom Fields on Additional Customization' available: Yes (Solved).
Source: Intuit Community forum.

Custom Fields on Additional Customization: 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.

Support for Additional Customization
Quickbooks Repair Pro will resolve it efficiently and affordably. Guaranteed resolution of your issue, or you pay nothing!

Error Recovery for Additional Customization [Canada]
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Additional Support Options: