- Getting started
- Licensing
- Setup and configuration
- Using Data Service
- Reference
- Examples & Tutorials
![](https://docs.uipath.com/_next/static/media/grid.05ebd128.png?w=3840&%3Bq=100)
Customizing an Entity
Data Service contains System built-in fields. When you create a new entity a set of default fields is automatically created still you can customize the entities you defined by adding specific fields.
You can create the fields of the following field types.
- Text: this field can be used to store a small amount of text.
- Number: this field can be used to store a number value. Number values can be positive or negative. You must specify the number of decimal places that you want to use.
- Yes/No: this field is used to choose between a Yesor No value.
- Date-Time: this field is used to store a value that contains a date and time. A date picker can be used to select a date and time.
- Relationship: this field is used to create a relation between two entities.
- Choice Set: this field is used to store a list of enumerated values from which one or more values can be selected.
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File: this field is used to store a file.
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Auto-number: this field is used to automatically increase record indexes.
To update the fields you created, follow the steps below:
- You cannot update system built-in fields.
- You cannot change the Name and the Type of customized fields.
To delete fields that you have created follow the below steps:
Role based field access can be used to restrict data access. It is possible to enable Role based field access for custom fields only, it is not available for system built-in fields.
After the Role based field access option is enabled for a field, the roles need to be updated to grant explicit permissions for users to access the field. See Manage access for more information.