---
title: beginConditionModification
slug: campaign/docs/beginconditionmodification
docTags: 
createdAt: 2026-07-02T19:01:47.121Z
---

**Type**: String

**Parameters**

| Name      | Type   | Value                  |
| --------- | ------ | ---------------------- |
| sessionId | String | ID of the session      |
| filterId  | long   | ID of the target group |

**Return values**

**modificationId** that is used by all condition altering methods

**Code structure**

```javascript
String beginConditionModification(String sessionId, long filterId)
```