QB Issue Resolution:

Good to see you here in the QuickBooks Community. I’m here to help isolate the error you’re getting with the time activity in QuickBooks Online (QBO).

 

The error occurs once the time activity is added to an invoice. You’ll need to delete it so you’ll be able to change the time activity from customer to project.

 

You can check this article on how to void or delete an invoice or other transactions.

 

Once done, you can now change the time activity from customer to project. 

 

For additional reference, you may visit this article to learn more about time activity timesheet.

 

Please know that I’m just a post away if you have any other questions about the time activity. Wishing you and your business continued success.

Resolution for Issue 'Why am I getting error “customer has an invoice already associated with this time activity” when I try to move a time activity from a customer to a project. I already moved the invoice to the same new project in my previous step which supposedly “unlinked” the time activity from the invoice, I even got a warning stating as much, so why am I getting an error that they are still associated and how can I get past this error?' available: Yes (Solved).
Source: Intuit Community forum.

Why am I getting error “customer has an invoice already associated with this time activity” when I try to move a time activity from a customer to a project. I already moved the invoice to the same new project in my previous step which supposedly “unlinked” the time activity from the invoice, I even got a warning stating as much, so why am I getting an error that they are still associated and how can I get past this error?: 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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