---
title: "Create or Delete Activity Relationships"
slug: "safran-project-integration-api-create-activity-links"
updated: 2026-01-30T07:41:36Z
published: 2026-01-30T07:41:36Z
canonical: "docs.safran.com/safran-project-integration-api-create-activity-links"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.safran.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Create or Delete Activity Relationships

## Create or Delete Activity Relationships

### /v1/activity_links

Maintain (create/delete) Relationships for Activities

### Example for calling:

http://server/v1/activity_links

Request Body = {...} see Request Fields below

### Allowed Methods:**

[POST] API Controller: **activity_links**

### Description:

Create/delete relationship is done in one single Web Service call with an indicator to specify Create or Update or Delete.

### Parameters:

| **Name** | **Type** | **Description** | **Notes** |
| --- | --- | --- | --- |
| owner | string | Networks owner | Optional Relates to "SafranWebApiOwnerVerificationDuringApiCalls" in [Application Settings](/v1/docs/application-settings) |

### Request Fields:

In addition to a few extra fields, the fields list are similar to "request fields" in [activity_links](/v1/docs/activity-links).

| **Name** | **Type** | **Description** | **Notes** |
| --- | --- | --- | --- |
| RowID | integer | Sequential number used in the communication with the API,which identifies a row in this request that lines up with the response. |  |
| RowAction | string | Intruction for the API of which action to perform | C = Create D = Delete |
| prev_id | integer | Id for preceding activity |  |
| next_id | integer | Id for succeeding activity |  |
| network_id | integer | Network ID |  |
| link_type | integer | Constraint link type (possible values: FS, SF, FF, SS) | 1 = SS 2 = SF 3 = FS 4 = FF |
| lag_time | integer | Lag time on the constraint activity link (unit of measure depends on calendar - could be days or hours for example) | Optional |
| calendar | integer | Activity Link Calendar ID | Optional |
| duration_format | string | Formatting unit for the lag_time field | Optional "weeks" "days" "hours" "minutes" "percent" "undefined" - meaning the database value is null or 0 |
| disabled | boolean | A field both in the Predecessors and Successors area of Logic Navigator and Links Panels, which allows to disable Links so they do not have an effect in the Activities linked | Default value False |

- Specifying activities in "prev_id" and/or "next_id" which does not exists will result in Failure

**Response Fields:**

Table with responce for the constraints request:

| **Name** | **Type** | **Description** | **Notes** |
| --- | --- | --- | --- |
| RowID | integer | Corresponds to the RowID in the request. |  |
| Result | string | S(uccess) or F(ailure) indicating if the request action was successfully executed. |  |
| Message | string | Empty if success; error message if the requested action failed. |  |
| MessageId | integer | MesageID: Identified error message |  |

**Sample Create Activity Links and Response**

**Show Call sample**

    

```
[
  {
    "RowId": 1,
    "RowAction": "C",
    "prev_id": 14,
    "next_id": 15,
    "network_id": 1,
    "link_type": 3,
    "lag_time": 3,
    "calendar": 1,
    "duration_format": "percent"
    },
  {
    "RowId": 2,
    "RowAction": "C",
    "prev_id": 12,
    "next_id": 15,
    "network_id": 1,
    "link_type": 3
    }
]
```

**Show Response sample**

    

```
[
  {
    "RowId": 1,
    "Result": "F",
    "Message": "Error Creating Activity Link: Activity Link already exists."
    },
  {
    "RowId": 2,
    "Result": "S"
    }
]
```