I appreciate you for bringing this matter in the Community forum, Innolan. We can check the Audit History to track the activities made to your invoices or estimates. These changes happen if the users have edited the amounts or if your customer has an existing credit and the auto-apply feature is enabled. Let me guide you through the steps to review these activities.
- Open the Invoice or Estimate transaction that has changes.
- Click the View/Edit.
- Choose More actions.
- Select Audit history.


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Let us know if you have further questions about managing your invoice and estimate transactions in QBO. Feel free to click the Reply button and we'll respond to you as soon as possible.