# 4.66. Viewer - Read different versions of connections - Required Premium License

<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;">4.66.</td></tr><tr style="height: 94px;"><td style="height: 94px;">**Description**</td><td style="height: 94px;">As a **<span class="notion-enable-hover" data-token-index="1">Viewer</span>**,

I must be able to access a specific physical link version,

So that I can compare previous and new versions of a physical link and understand the works that have been performed on site.

</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;">Viewer</td></tr><tr style="height: 29px;"><td style="height: 29px;">**API Calls**</td><td style="height: 29px;">**GET** /physical-links

**GET** /physical-links/&lt;physical-link-id&gt;

</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. 1. The User must be authenticated and have the **Viewer** role.
    2. The user must have the source, destination and Physical Link Type of a physical link for which he wants a specific version.

### Postconditions

1. The System returns the given version of the physical link.

### Main flow

1. The **User** requests a specific version of a physical link.
2. The system returns the requested version.

### Exceptions

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

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

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