Is the accountant obligated to continue in his job if his employer asks him to falsify monthly sales reports to deceive the landlord into reducing the amount of rent due?

It is not permissible to contract for the rent of a shop to fluctuate between a known amount and a percentage of sales, due to the uncertainty of the rent. This falls under the prohibition of "two transactions in one." This contract must be annulled, and the landlord is entitled to a fair market rent for the period that has passed. It is not permissible to lie as requested by the employer.