What is the ruling on receiving a nature of work allowance when the designated work is not performed, and is it obligatory to demand to work under the job title to avoid unlawful money?

The reference for entitlement to an allowance is the employer's system. If the allowance is granted solely based on the job title, then it is permissible to take it. However, if it is granted for performing the work itself, then it is not permissible. The administration's grant of it does not make it lawful unless it is authorized to disburse it in this specific situation.