QB Issue Resolution:

if you file taxes using cash based accounting (check your previous tax form) then it makes no difference since only cash received is counted for income tax.

If you are on accrual, then the income will be part of taxable sales. Moving an order from one fiscal year to another is something you should talk over with your tax accountant if you have one, or a tax accountant you call and ask

Resolution for Issue 'moving end of year transactions to the following year' available: Yes (Solved).
Source: Intuit Community forum.

moving end of year transactions to the following year: 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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