Usually, if you try to use a cross class skill which is not equipped while standing up (not in crafting mode), the system says: "Cannot Use this Skill with Current Class" (or something similar).

If, instead, the cross class skill is equipped, the message is something like: "Can only use this skill during Synth".

This does not happen with some skills (Rapid Synthesis tested for sure); if you have Rapid Synthesis not equipped and you try to use it in non-crafting mode, the message is still "Can only use this skill during Synth".


I use different bars for different crafts, and checking system messages given when using the skills on the cross-hotbar helps me make sure I equip the right cross-class skills before commencing a craft; the rapid synth issue is confusing.


I play from PS3, if that does help.