What is the ruling on working in accounting in the tourism sector?

The field of tourism is broad and diverse, and it is divided into three categories: permissible, with no objection to working in it as an accountant or otherwise; forbidden, where working in it is absolutely prohibited; and mixed, where working in the permissible aspects is allowed, but it is preferable to avoid it. Based on this, if the accountant's benefit is permissible, then there is no objection to him. But if it is forbidden or aids in something forbidden, then his work and his earnings are forbidden. And if his work is mixed, then the forbidden portion of his earnings is proportionate to the forbidden portion of his work.