what kind of a rule is that??? If a person wants to take leave he can take one day casual or sick. The company cannot force him to take 6 more days (it's other way around wr I work..If I ask for 07 days they will give me 01 day).
If the person has not gone on leave for a long time company might force him to go on compulsory leave (which rarely happens in qatar...lol) but thats also paid leave.