# ST-USG-017 - Invalid parameter modifier

> **Rule ID**: `ST-USG-017`

**Rule ID**: `ST-USG-017`

**Scope**: Coded workflow

## Description

When the `Execute()` entry method contains `out` or `ref` parameters, an error is shown.

## Recommendation

Avoid declaring `out` and `ref` parameters for the `Execute()` entry method, such as in the following example:

```
public void Execute(ref string location, out string country)
```