No, you cannot have calculated remuneration while you are receiving medical and rehabilitation allowance. You need to contact the tax authorities and have it stopped.

A person who is self-employed should calculate their own remuneration (salary) for their work. This salary is treated in the same way as general salary payments to employees, meaning that a cash payment of public levies must be calculated from it, social security contributions must be paid, and contributions must be made to a pension fund.