QB Issue Resolution:

Click on your company name in the top right corner > Company Settings > Sales > Custom Fields > Make sure the box under public isn’t checked so your customers don’t see it > Save > Done

You will now be able to see that field when you pull up an invoice.

Please let me know how that goes.
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Resolution for Issue 'Suppliers invoice Number on Our Client Invoice.' available: Yes (Solved).
Source: Intuit Community forum.

Suppliers invoice Number on Our Client Invoice.: 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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