Hi @silvianjim,
I'll share insight into this situation about the Accountant's Copy in QuickBooks Desktop (QBDT).
The dividing date you set when you create an Accountant's Copy determines which part of the company you and your accountant can make changes. An accountant can edit transactions that fall on or before the dividing date, while you can modify transactions after the dividing date. It's in place to avoid the exact situation you stated above.
Another option you have is to set a closing date, along with a password. This way, you can ensure that there aren't any unexpected changes made to your books before the closing date.
More information about this feature is in this article: Close your books in QuickBooks Desktop. It's explained in detail what happens to your company file while this feature is enabled, along with screenshots for your reference.
Place a comment below if you have other concerns, and I'll get back to you.
