QB Issue Resolution:

Ideally, if a customer pays in cash (immediate payment), you will enter the sales transaction as a sales receipt. Since you’ve created an invoice, you have to link the payment and then deposit it to the Petty Cash account.

 

I’ll show you how:

  1. On the top menu, click the Plus icon.
  2. Choose Receive Payment.
    1.JPG
  3. Enter the customer name.
  4. Select Cash as the Payment method.
  5. Choose the Petty Cash account for the Deposit to field.
  6. Select the invoice transaction.
  7. Click Save and close.
    2.JPG

For additional references, you can open the links below:

Please let me know how it goes or if you have any follow-up questions about invoices. I’ll be here if you need further assistance. Wishing you all the best!

Resolution for Issue 'Customer paid in cash but the owner kept the cash for expenses (petty cash). How do I close the invoice?' available: Yes (Solved).
Source: Intuit Community forum.

Customer paid in cash but the owner kept the cash for expenses (petty cash). How do I close the 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.

Support for Invoices
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Error Recovery for Invoices [Canada]
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