In certain situations, in this case when you try to edit content created by the admin, eZ Enterprise won't allow you to edit that content even if you have effective permissions and will return a warning message: Could not load the user with id '/api/ezp/v2/user/users/14'.
- With "admin", create the "Article #001".
- Create the "user_001" in the editor's group (by default, an editor has content\all functions\No limitations).
- Log with "user_001" and try to edit "Article #001". You will get the Could not load the user with id '/api/ezp/v2/user/users/14' warning message and won't be able to proceed.
Note: even if you give all modules\all functions\No limitations to the editor's group, the error will persist.