When using the Pslam code doctrine "Hermeticon Psalm + Galvanic Psalm + Iron Psalm"  (Convert 100% physical damage to warp) items which provide " (% chance) warp vulnerability upon warp damage" are not functioning.  The damage is still being treated as physical.  

However, using the perk "Dirversive tactics" which apply vulnerability to opposite elements (i.e. warp and physical upon heat damage) IS recognizing the converted damage as being warp damage and applying physical and heat vulnerability.  

These two seem to be inconsistent with each other, either the damage should be considered warp and apply warp vulnerability with the appropriate item stat - OR it should still be treated as a physical application and be functional with "Diversive tactics" inversion vulnerability. 

I do not know if this holds true with "vulnerability upon respective critical hit" but I imagine it does.