This fatwa defines underhanded marriage (nikah di bawan tangan) as 'a marriage that meets all the pillars and requirements stipulated at fiqh (Islamic law), but without being officially registered with the authorised agency as regulated in legislation.' The fatwa states that underhanded marriage is lawful because it meets the requirements and pillars of marriage, but haram (forbidden) insofar as it creates a problem or loss. Therefore, marriage must be officially registered to prevent such a problem or loss.