Why I cannot create issues inline in GanttTable?
If you encounter scenarios where you cannot create issues inline within GanttTable, it can be due to one of these reasons.

1. Fields that support Display-Only
Some Jira fields are meant for display purposes only in the table view. This means that you can view the values of these fields in the table but cannot edit these fields directly within the table in the app.
As a result, if you include these display-only fields in your custom structure, you may not be able to create a new inline issue in the group.
Here are the examples of display-only system fields:
Created
Updated
Team
Organizations
Satisfaction
Votes
Watchers
Satisfaction date
Participants of an issue
User name of last udpater or commenter
2. Require the Create Issue Permission
To create a a new issue in GanttTable, users must have the “Create Issues” permission in the Jira project.
So if you encounter this error message, double-check your permissions and notify your Jira admin or project admin.
For more details, please read How to set up permissions for creating, editing, and deleting in company-managed projects.