> For the complete documentation index, see [llms.txt](https://www.zerabooks.com/help/llms.txt).

# Apply a correction to similar transactions

After you fix one line's category, ZeraBooks offers to apply the same category to similar transactions from the same merchant, in one click.

## Fix one, then the rest

1. In **Banks & Cards**, switch to **Edit** and change a line's category. See [Review and fix categories](https://www.zerabooks.com/help/banks-and-cards/review-and-fix-categories).
2. If other transactions from the same merchant have a different category, a banner appears: "{n} similar transactions have a different category. Apply {category} to those too?"
3. Click **Apply to {n} similar**, or **Dismiss** to leave them as they are.

![After you change a category, a banner offers to apply it to similar transactions: Apply to 3 similar, or Dismiss](https://www.zerabooks.com/help/shots/banks-apply-to-similar.png)

When it's done, the banner says "Updated N similar transactions to {category}."

## What counts as similar

A transaction is similar when it comes from the same merchant and moves money in the same direction (both money in, or both money out). ZeraBooks looks across all of the company's bank and card accounts and all dates.

It never changes:

- lines someone already categorized by hand;
- transfers and credit-card payments;
- bill and invoice payments;
- lines matched to a manual entry;
- lines cleared in your opening books.

{% hint style="info" %}
**Tip:** Your correction is also remembered for future statements, so the same merchant is categorized the same way next time.
{% endhint %}

## Frequently Asked Questions

<details>
<summary>Can I fix every transaction from one merchant at once?</summary>

Yes. Fix one line, then click **Apply to {n} similar** on the banner. To change unrelated lines together instead, select them and use **Set category**.
</details>

<details>
<summary>Why didn't the banner appear?</summary>

No other transaction from that merchant, in the same direction, has a different category, or all of them were set by hand, are transfers or payments, or are matched.
</details>

<details>
<summary>What does "These similar transactions are already resolved" mean?</summary>

Between the offer and your click, those transactions were already changed. No changes were needed.
</details>

<details>
<summary>The banner says similar transactions could not be checked. What do I do?</summary>

Your category was saved, but the check for similar transactions failed. Click **Check similar** to try again.
</details>

<details>
<summary>Is there a limit?</summary>

Yes. If more than 1,000 similar transactions need review, ZeraBooks asks you to narrow the changes in the register before trying again.
</details>

<details>
<summary>Can I undo Apply to similar?</summary>

There's no undo button. Change the categories back in **Edit**, one at a time or with **Set category** on selected lines.
</details>

---

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