### Steps to reproduce

1. Create an admin-only project attribute that is required for all projects

1. Login as a user with admin permissions

2. Go to Administration > Projects > Project attributes

3. Click on "+ Add" and select "Project attribute"

4. Fill in the Name and Section fields.

5. Select Text (the default) as Format.

6. Check "Required for all projects"

7. Check "Admin-only"

8. Do not fill in or check any other fields.

9. Click "Save"

2. Login (in a separate, private window pr desktop) as a user with the global project create permission.

3. Click the green + button in the top-left.

4. Fill in Name and all other required fields (denoted by an asterisk)

5. Click "Save"

<br>

The project will not be saved, and the user will be shown a validation error (via flash message) indicating that the admin-only project attribute can&#39;t be blank.


### What is the buggy behavior?

1. Begin of the insertion\_EITHEREnd of the insertion Begin of the deletion _EITHEREnd of the deletion (tbc) Begin of the insertionu\_sersEnd of the insertion Begin of the deletion u_sersEnd of the deletion should not be able to create admin-only project attributes that are required for all projects.

2. _OR_ the project is not saved and the user is shown the validation error.


### What is the expected behavior?

1. Begin of the deletion _EITHER (tbc)_End of the deletion &quot;Required for all projects&quot; and &quot;Admin-only&quot; should be mutually exclusive options on the Project attribute creation form. Begin of the deletion

2. _OR_ validations for admin-only Project atributes should be skipped on Project creation.End of the deletion


Begin of the insertion### Out of scope

Migrate existing &quot;admin only&quot; &amp; &quot;Required for all projects&quot;.&nbsp;

End of the insertion ### Screenshots and other files

<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/644338/content"><img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/644314/content">

### Environment information

_Please check and fill out the following details to help us identify in what versions and distributions of OpenProject the error occurs_

**OpenProject installation type**

* Hosted cloud edition


**OpenProject version**

**Core build**

[4e98f0c7dbe601a99e9440e7a08edc2cdaa5d0d7](https://github.com/opf/openproject/commits/4e98f0c7dbe601a99e9440e7a08edc2cdaa5d0d7)

**Product version**

[c778ff30a6cda2a75c540d3e3e20425f047f4bc6](https://github.com/opf/saas-openproject/commits/c778ff30a6cda2a75c540d3e3e20425f047f4bc6)

**Core version**

OpenProject 16.1.0

**Browser**

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

**Operating System**

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

**Language**

_en\_GB_