Is the manager considered sinful if he uses falsified invoices to guarantee workers' rights or secure essential operational requirements that generate profits for the company and prevent losses? Or is he sinful if he complies with the employer's erroneous decisions that oppress the workers, knowing that he advised him and explained the mistake, but the employer insisted on his decision?

The agent representing the employer must act in a way that serves the principal's best interest, without violating his permission. It is not permissible for him to lie or deceive the employer with fictitious invoices. If he deviates from what the employer requests, he should offer advice. If the employer does not respond, then the agent must carry out what was requested of him, unless it involves a religious transgression. Otherwise, he should apologize or resign. The question did not clarify the nature of the injustice inflicted upon the workers due to the employer's request.