The error ***“View ’XXX’. Insert operation is not allowed”*** may occur when the user performing INSERT operation does not have enough privilege over the view or the view is not updateable.
Hence, I would ensure that the user performing the INSERT operation has enough privilege, and also the view where the user tries to insert is updateable.
You can refer to the section [Inserts, Updates and Deletes Over Views](https://community.denodo.com/docs/html/browse/latest/en/vdp/vql/inserts_updates_and_deletes_over_views/inserts_updates_and_deletes_over_views#inserts-updates-and-deletes-over-views) of the Virtual DataPort VQL Guide which lists the views which cannot be updated.
If you still need help and you have a valid support user account, please open a new support case at the [Denodo Support site](https://support.denodo.com/) so that the support team can assist you.
Hope this helps!