Just enter the closing date password.  However, have you already filed the taxes for 2015?  Perhaps you shouldn’t void the invoice since it will change the prior year totals.  Check with your accountant or tax professional for guidance.

Resolution for '2015 invoice issue: 'how do i void a 2015 invoice after locking year end accounting' available: Yes.

The 2015 invoice 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 2015 invoice issue yourself by looking for a resolution described in the article. If it is a complex 2015 invoice issue or you are unable to solve the issue, you may contact us by clicking here or by using other 2015 invoice support options.

For more information about resolving issues related to 2015 invoice in Quickbooks/QBO or to get support for the issue 'how do i void a 2015 invoice after locking year end accounting', click the link below: