I recently refreshed my Org's Full Sandbox.
When an Experience Site User accesses a Custom Object record, he gets an error stating:
Unable to create/update fields: [custom field]. Please check the security settings of this field and verify that it is read/write for your profile or permission set.
I triple-checked to confirm the user's profile has read/write access to the field.
What's more -- I added that same field to the page layout. And the User was able to edit the field.
Finally, the issue DOES NOT occur in Production.
Two questions here:
- Why would this happen in Sandbox, but not in Production?
- Why can the user edit the field when I place it on the page layout, but not when it's part of the Path?
I have the same issue with the Path component - user able to edith the field on the layout, but the path gives the error as yours. I believe it has something to do with recent SF release.
upd: user able to use path again after I gave "create" permission to the object on the profile level. Definitely something is broken on SF side.