Balances doubled upon importing chart of accounts from the browser, how can I reverse this?

[PiaS1]

Hi,

I wanted to deactivate a bunch of accounts, and instead of doing it manually, which would have taken so much time, I followed instructions from the browser.

I did export my chart of accounts, edited it in Excel, replace N by Y for all the accounts I wanted to deactivate, saved the file, and imported it, again following instructions. No problem with this.

At no point I was asked to select or unselect balances in the export or import process, as I can see could be done in some previous versions.

So when I imported my updated Chart of accounts, all the account balances had doubled!

Not sure how to reverse this operation, what options do I have to restore my actual accounts balances shown just before the export/import process?

Do I need to enter manually opening balances to each of them? Why did I not see this options of selecting or unselecting balances?

Attaching 2 screenshots with options I had.

Thanks in advance for your comments!

Sincerely,