Invoice items (*Rechnungs-Positionen*) are fixed amounts per client, for example a monthly base fee or a system flat rate. They are either added automatically to every client statement or offered for selection when you create the statement under **New position** (*Neue Position*).

## Before you start
- Your user needs the permissions for the invoice items in the cost settings – ask your administrator.
- The client is an active client of yours, see [Clients](/company/clients.md).

## Step by step
1. Open **WMS › Settings › Cost settings › Invoice items** (*WMS › Einstellungen › Kosteneinstellungen › Rechungs-Positionen*).
2. Click **Create position** (*Position anlegen*).
3. Choose the **Client** (*Mandant*) and enter a **Name** (*Name*).
4. Optionally enter a **Detailed description** (*Detailbeschreibung*) – it appears line by line on the invoice.
5. Enter the **Quantity** (*Menge*, optional, default 1) and the **Individual costs** (*Einzel-Kosten*).
6. Tick **Active** (*Aktiv*) and choose **Insert on each invoice** (*Auf jeder Rechnung einfügen*): **Yes** (*Ja*) or **No** (*Nein*).
7. Optionally set a [validity period](/billing/validity-period.md) and click **Save** (*Speichern*).

![Screenshot: Invoice item form with Client, Name, Detailed description, Quantity, Individual costs, Active and "Insert on each invoice" set to Yes](/billing/images/invoice-items-form.png)

## Fields and options
| Field | Meaning | Required |
|---|---|---|
| **Client** (*Mandant*) | The client this item belongs to. | yes |
| **Name** (*Name*) | Name of the item on the statement. | yes |
| **Detailed description** (*Detailbeschreibung*) | Description on the invoice, shown line by line. | no |
| **Quantity** (*Menge*) | Number of units. Default 1. | no |
| **Individual costs** (*Einzel-Kosten*) | Price per unit. | yes |
| **Active** (*Aktiv*) | Only active items are used. | – |
| **Insert on each invoice** (*Auf jeder Rechnung einfügen*) | **Yes**: added automatically to every statement (within the validity period). **No**: only available manually via **New position**. | yes |

## How invoice items are used
- **Yes – on every statement:** the item is added as a fixed line with quantity × individual costs whenever you open the [client statement](/billing/client-billing.md) and the validity period overlaps the billing period.
- **New position on the statement:** the selection lists all **active** invoice items of the client in the selected warehouse – regardless of "Insert on each invoice". Name, description, quantity and price are copied into the statement, where you can still change them.

![Screenshot: Client statement with the "New position" field open and the drop-down of saved invoice items of the client](/billing/images/invoice-items-new-position.png)

## Example
- "Monthly base fee", quantity 1, 99.00 €, **Insert on each invoice: Yes** → appears automatically on every monthly statement.
- "Inventory count (hourly)", quantity 1, 45.00 €, **Insert on each invoice: No** → you add it manually in the months in which an inventory count took place and adjust the quantity.

## Good to know / Troubleshooting
| Message | Cause | Solution |
|---|---|---|
| The entry has been saved / The entry has been updated | The item was saved. | – |
| The item does not appear under "New position" | The item is inactive, or a different warehouse is selected. | Tick **Active**, or switch the warehouse at the top right. |
| The item no longer appears on new statements | **Active** is unticked or the validity period has ended. | Check **Active** and the [validity period](/billing/validity-period.md). |

- To stop charging an item, untick **Active** or set **Valid until**.
- Use **Duplicate** (*Duplizieren*) in the list to copy an item for another client. The copy is inactive until you activate it.