# 4.31. Editor - Add a site

<table border="1" id="bkmrk-id-4.1.-description-" style="border-collapse: collapse; width: 100%; height: 268px;"><colgroup><col style="width: 50%;"></col><col style="width: 50%;"></col></colgroup><tbody><tr style="height: 29px;"><td style="height: 29px;">**Id**</td><td style="height: 29px;">4.31.</td></tr><tr style="height: 94px;"><td style="height: 94px;">**Description**</td><td style="height: 94px;">As an<span class="notion-enable-hover" data-token-index="1"> **Editor**</span>,

I want to be able to create a site for an address that already exists in the register,

So that I am not blocked by missing information and can perform my contribution.

</td></tr><tr style="height: 29px;"><td style="height: 29px;">**Priority**</td><td style="height: 29px;">**<span style="color: rgb(224, 62, 45);">High</span>**</td></tr><tr style="height: 29px;"><td style="height: 29px;">**Actors**</td><td style="height: 29px;">User</td></tr><tr style="height: 29px;"><td style="height: 29px;">**API Calls**</td><td style="height: 29px;">**POST** /sites</td></tr><tr style="height: 29px;"><td style="height: 29px;">**Linked Processes**</td><td style="height: 29px;">  
</td></tr><tr style="height: 29px;"><td style="height: 29px;">**Status**</td><td style="height: 29px;"><span style="color: rgb(22, 145, 121);">**Implemented**</span></td></tr></tbody></table>

### Preconditions

1. The User must be authenticated and have the **Editor** role.
2. The User has on or more addresses to which the new site needs to be assigned to.
3. The User has the mandatory site information

### Postconditions

1. The system returns the created site

### Main flow

1. The **Editor** uses an API call to create a new site for a given list of addresses.
2. The system validates the input parameters.
3. The system returns the created site

### Exceptions

#### \[400 Bad Request\] Invalid input:

If mandatory fields are missing or invalid, the system returns an error message.

#### \[409 Conflict\] Addresses already used

Error returned by the system if the all or some of the given address are already linked to another site or block.

#### \[500 Internal Server Error\] System Error

If the system fails to save changes due to an internal error, it displays an appropriate message and logs the error for further investigation.