I am a lvl 20 Blacksmith. I did all the materia quests. When I try to put a Str 1 and/or Vit 1 materia on any of the lvl 20 iron gear I crafted i get this message, "The selected item level too low to maximize materia potential" with in red letters Vit+0.

So I thought that I need the tier2 version of these materia but that doesnt work either, any solutions?