Greater Weapon Focus will proc up to once each turn for each weapon. It will...

Greater Weapon Focus will proc up to once each turn for each weapon.  It will not proc if the target is outside of melee range. or if .turn_procs._no_melee_recursion = true.

This means that some ranged melee attacks (Wave of Power, some usable item powers, like Champion's Will, Kenetic Spike, and projection weapons) may trigger GWF if the target is close.

Certain attacks always disable GWF recursion: Fan of Knives melee strike, Hammer Toss melee strike, Forge Echoes AOE melee, Beyond the Flesh melee attack,  Borosk's Hate extra attack.

 always.annot proc recursion (turn_procs._no_melee_recursion = true to prohibit)