QB Issue Resolution:
You can set this in the Advanced settings on the client’s account by going to the Gear icon > Accounts and settings > Advanced > Accounting.
Here, you can enter the first month of the financial and tax year, and use the feature ‘Close the Books’ to enter an end date.
You can see more on the close the books function here
Resolution for Issue 'Where do you set year end details for client accounts' available: Yes (Solved).
Source: Intuit Community forum.
Where do you set year end details for client accounts: 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 accounting
Quickbooks Repair Pro will resolve it efficiently and affordably. Guaranteed resolution of your issue, or you pay nothing!
Error Recovery for accounting [Canada]
E-Tech is the #1 Quickbooks data migration and Conversion service provider.
Additional Support Options: