### Steps to reproduce

1. Login as a user with permissions to add and edit relations

2. Go to any WP

3. Go to the Relations tab

4. Click on 'Add Relation' and add any type of relation

5. click on the 3 dots next to the added relation

6. Click on Edit


### What is the buggy behavior?

* WP field is greyed out


Begin of the insertion_<img class="image_resized op-uc-image op-uc-image_inline" style="width:433px;" src="/api/v3/attachments/326896/content">_

End of the insertion ### What is the expected behavior?

1. Begin of the deletion If i recall correctly, there should be noEnd of the deletion WP field Begin of the insertionis greyed out but shows some information about the WPEnd of the insertion Begin of the deletion when editing (but i&#39;m unsure)End of the deletion


Begin of the insertion<br>

<img class="image_resized op-uc-image op-uc-image_inline" style="width:456px;" src="/api/v3/attachments/326910/content">

End of the insertion ### Screenshots and other files

Begin of the insertion<br>End of the insertion Begin of the deletion _<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/326896/content">_End of the deletion

### Environment information

**OpenProject version**

_15.3.1_

**Browser**

* [x] Chrome
* [x] Firefox
* [ ] Safari
* [ ] Mobile Safari
* [ ] Other (please specify)

**Operating System**

* [x] Windows
* [x] Mac OS X
* [ ] Mobile iOS
* [ ] Mobile Android
* [ ] Linux (please specify distro)
* [ ] Chrome OS
* [ ] Other (please specify)