QB Issue Resolution:

Great question!  You have a couple of options on how to handle this.  You can either void the existing invoice and create a new one with the services provided, or you can just edit the existing invoice, remove the items that haven’t been provided, and re-send to the client.

Resolution for Issue 'I submitted an invoice to a client who now wishes to cancel the contract. Some of the services have already been provided so I need to raise an invoice to cover this lower amount. What is the best way to do this in QB so that the reporting is accurate and doesn’t show the original invoice amount as AR?' available: Yes (Solved).
Source: Intuit Community forum.

I submitted an invoice to a client who now wishes to cancel the contract. Some of the services have already been provided so I need to raise an invoice to cover this lower amount. What is the best way to do this in QB so that the reporting is accurate and doesn’t show the original invoice amount as AR?: 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 Invoices
Quickbooks Repair Pro will resolve it efficiently and affordably. Guaranteed resolution of your issue, or you pay nothing!

Error Recovery for Invoices [Canada]
E-Tech is the #1 Quickbooks data migration and Conversion service provider.

Get 50% off Quickbooks Online

Click Here for 50% off!

Additional Support Options: