The reference page for the structure fields states, that it is possible to define a structure field inside a structure field → https://getkirby.com/docs/reference/panel/fields/structure#fields
I tried setting up a nested structure field, in order to allow a user to create categories and then create items (consisting of multiple fields, hence the structure field inside the structure field) inside those categories:
projects:
label: Personal Projects
type: structure
fields:
project_categories:
label: Project Categories
type: structure
fields:
info:
label: Project Info
type: text
client:
label: Project Client
type: text
year:
label: Year
type: date
Unfortunately, I get the following error when trying to enter something into the field:
Where am I making a mistake? Or is it actually not possible to put structure fields inside structure fields?