Why am I unable to associate a field to a screen?

Danno

I'm setting up a classic software project and wanted to use a custom field that was created in a Next Gen project. If I go to the Default Field configuration as shown below:

It shows the field as not being associated with any screens. When I edit the configuration I am unable to find that field to change it's configuration. I am also unable to find it in the custom field list. 

I am also unable to add the field to the screen.

What am I not understanding here? If this is one of the things you can't do with mixed systems then why does it show up in the original Field configuration screen if it can't be added to the project.

Fazila Ashraf

@Danno  , 

Fields in next-gen projects are contained within the project itself. Currently, you can't share a field created in one next-gen project with another next-gen project, or with a classic project. Similarly, you can't use a custom field created in a classic project on your next-gen project issues

 

Refer to https://support.atlassian.com/jira-software-cloud/docs/available-custom-fields-for-next-gen-projects/