# Custom Permissions

MetalSoft's custom permissions allow complex, custom rules based on CASL conditions, custom fields etc. 

## Conditions

The **Conditions** uses the CASL convention. Reffer to this resource for more details: [Conditions in Depth](https://casl.js.org/v6/en/guide/conditions-in-depth)

## Fields

The **Fields** list for a particular Subject can be determined from the swagger documentation `https://<your-env-hostname/api/v2/swagger` and scrolling at the bottom of the page. The fields included in the list will be the only ones allowed. If none is entered, all fields can be changed by the User (Principal) operting on the Subject