Do administrative tasks belong to the professional image of truck drivers?

Hi @ all, I would be interested to know if the writing of freight letters, CMR, pallet tickets etc. is part of the activity of a truck driver or is this a voluntary performance that we do there. Actually, we are hired to drive plus related activities such as load securing, refueling, departure controls etc. and not as a dispatcher or secretary. I ask against the background that we have salary cuts and I wonder why I should continue to work with the same intensity as before. Could that refuse these activities, take a warning after yourself? I want to avoid this as I consider legal step against the company, but what is another topic. Thank you for reasonable answers.