# Configuration entry

## Description:

A configuration entry can be one of multiple types. You can choose out of one of four possible [geometries ](https://docs.datagym.ai/documentation/entry-types#available-geometries)and one of three possible form-elements for your [classification ](https://docs.datagym.ai/documentation/entry-types#available-classifications)questions. They are described on [the page about entry types](https://docs.datagym.ai/documentation/label-configuration/entry-types).

{% hint style="warning" %}

#### Restrictions:

* Every entry must be a unique export key 
* Shortcuts cannot be used twice

The configuration cannot be saved while invalid.
{% endhint %}

## Nesting of geometries and classifications:

Geometries can be nested one level deep and only as child of another geometry. Classifications may be nested up to three levels deep and as wide as you choose. They can be attached to a geometry or set up as global classifications attached to the image.

### Example:

![](https://622290927-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LzaIa2HtqaLgqpL5TFA%2F-MA_gAJJTFsi5vVlO1WN%2F-M6iYVX99SXsu8_1-6r3%2Fdg-label-configuration.png?alt=media\&token=53fe2511-12de-4832-b649-9a3f2d857423)

## Related documents:

{% content-ref url="entry-types" %}
[entry-types](https://docs.datagym.ai/documentation/label-configuration/entry-types)
{% endcontent-ref %}

{% content-ref url="creating-an-entry" %}
[creating-an-entry](https://docs.datagym.ai/documentation/label-configuration/creating-an-entry)
{% endcontent-ref %}

{% content-ref url="editing-an-entry" %}
[editing-an-entry](https://docs.datagym.ai/documentation/label-configuration/editing-an-entry)
{% endcontent-ref %}