QB Issue Resolution:
If QBO is set-up for Non-Profit, this is the account name use (Pledge) instead of an Invoice.
Open up the Pledge window > hit Customize (one in the bottom) > Header tab > rename Pledge to Invoice (or you can rename it as you seems fit).
Resolution for Issue 'QBO is using Pledges instrad of Invoices' available: Yes (Solved).
Source: Intuit Community forum.
QBO is using Pledges instrad of Invoices: 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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