There are some smart guys who do not need fast food, he just needed some hints to cook the meal himself.
If you know how fields are customized for a material master then the given answers should be sufficient for you too. Actually it should even be possible without knowing the customizing since everything to assemble it is available in the discussion. Had you tried to follow the given hints? Have you been in OMS9? Have you seen that there are field groups having more than just one field? Did you realize that you can only set field groups as mandatory, hidden, optional...? This was the basics. And then the info from the function module, it returns the status (mandatory, hidden, optional...) by group.
Whats left? you need to check the group again to know which fields are in the group