Cost Control
You can keep an invoice with the cost item it settles, and you know where it is stored.
The **Attachments** panel keeps a file against the row it justifies. In the budget that is a quote or an offer against an account; in cost control it is the invoice against the item that settles it. It is the same panel — see [attach files to accounts](/kb/article/attach-files-to-accounts).
**Attachments go on the cost item, never on the account above it.** Select an account and the panel is still there, but read-only: an account in a cost control set has nothing to hang a file on.
That is the right shape for the work rather than a limitation to work around. An invoice settles one booking; the account is the sum of its bookings, and a file attached to the sum would belong to none of them.
**Add attachment** in the panel header. **Delete attachment** removes an entry, **Save a copy…** writes it back out to disk, and double-clicking an entry opens it.
Name the file what the accountant will search for. The demo uses the invoice number, so the panel entry and the item's **reference** read the same.
The bytes are stored **inside the set**, not linked from the folder you added them from. Two things follow:
- Deleting or moving your local copy afterwards does not empty the attachment. - A set carrying many scanned invoices is a correspondingly large file.
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