# Aggregated export lines

Export Mode Aggregated sends one row per account + BU + tax rate; invoice Aggregated view matches the worker.

When accounting export mode is **Aggregated**, Cortena sends one row per account + business unit + tax rate, not every invoice line. The invoice detail **Aggregated** view shows the same stored rows the export worker uses.

**Who this is for:** Finance teams whose ERP or DATEV import expects aggregated booking lines instead of line-item detail.

## 1. Set export mode

1. Open **Settings → Accounting preferences**.
2. Under **Export Mode**, choose **Aggregated (By account + BU code + tax rate)** (or keep **Detailed (Individual items)**).
3. Save.

Detailed mode remains available for tenants that need one export row per line item.

## 2. Review on the invoice

1. Open a payable or expense with a line grid.
2. Use **Line export view**: **Line items** | **Aggregated**.
3. When the tenant mode is Aggregated, the Aggregated tab is what Cortena sends. A banner states that this is what goes to the accounting system.
4. While sync runs you may see **Refreshing aggregated export lines…**. Editing line items updates the aggregated view after sync.

If the tenant is still on Detailed, Aggregated is **preview only**. Change export mode under Accounting preferences to send aggregated rows.

## 3. Manual edits

If you manually change aggregated rows, saving line items may warn that saving will overwrite those manual changes. Confirm only when you intend to rebuild from lines.

Older invoices synced before aggregated storage may show that historical aggregated data is unavailable. Reprocess or contact Support if you need a backfill.

## Tips and limitations

- Export preview and the worker both use **stored** aggregated lines, not a one-off calculation in the browser.
- Related: [DATEV Rechnungswesen](https://help.cortena.ai/guides/integrations/datev-rechnungswesen), [Connecting accounting](https://help.cortena.ai/guides/get-started/connecting-accounting), [Export line items to Google Sheet](https://help.cortena.ai/guides/workflows/export-line-items-google-sheet) (workflow, not the same as Aggregated mode).

## Quick reference

| Task | Where |
| --- | --- |
| Choose Aggregated | Settings → Accounting preferences → Export Mode |
| Preview / edit view | Invoice detail → Line items |