QB Issue Resolution:

bring up the sales receipt and use the more menu at the bottom select delete or void

for the future, sales receipts are used when you get paid on the spot, invoice is used when the customer will pay you later

Resolution for Issue 'How do I reverse a sales receipt that already processed but should have been cancelled. Will not receive any payment.' available: Yes (Solved).
Source: Intuit Community forum.

How do I reverse a sales receipt that already processed but should have been cancelled. Will not receive any payment.: 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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