QB Issue Resolution:
There is not currently an option to customize purchase orders in QuickBooks Online. You may want to submit a feature request for a customize option to be added. You can do that by clicking on the Gear at the top and selecting Feedback. Requests entered there will be considered by the software engineers for inclusion in future updates.
Resolution for Issue 'How do I customize Purchase Order forms using QB Online so that they show the data I want them to show?' available: Yes (Solved).
Source: Intuit Community forum.
How do I customize Purchase Order forms using QB Online so that they show the data I want them to show?: 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 Invoice
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Error Recovery for Invoice [Canada]
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