# Rule type Constant

Use this rule type to set the value of a transaction field to a constant value.

![Guide Matching constant rule](/assets/guided-matching-constant-rule.056d1aa0eaf2d26fb8fd91632e8c5ae75f049d946f90231e91d65f0962086fe4.f78e0b2f.png)

## Constant setup

| Setting | Description |
|  --- | --- |
| Constant | The constant value for the transaction field |