As I have mentioned This happens at random times, sometimes it works sometimes it doesn't, The rights are not being changed, so why does it work sometimes if the access rights are not correct?

How many pos sessions are you using and what about the users assigned to them

Hi,

Only One POS. At the times of the Error, no one can open the POS app except the super admin user.

ensure the user has enough access rights to journals, fiscal position, payment methods and invoicing

If the access rights are not set correctly, then why would it work sometimes and then sometimes not?

error raies when you are trying to read, write, delete,create the related model

Ive gone to Settings -> Technical -> Access control and enabled full rights for all POS related settings and still getting the Error.