Building damage not registering

// Ammodepot script
datablock StaticShapeData( AmmoDepot )
{
  category = "Building";
  shapeFile = "~/data/shapes/buildings/ammodepot.dts";
  sticky = true;
  lightType = NoLight;
  mass = 1;
  respawn = false;
  elasticity = 0.2;
  friction = 0.6;
  emap = true;

  maxDamage = 100.00;
  destroyedLevel = 99.00;
  repairRate= 0.0;
};

// create shape
%AmmoDepot = new StaticShape() {
 datablock = AmmoDepot;
};

function AmmoDepot::onAdd(%this,%obj)
{
  %obj.setRepairRate(0);
  echo( "I am repairing!!" );
}

function AmmoDepot::onCollision(%this,%obj)
{
  %obj.determineDamageState();
   echo( "Something hit me!!" );
}

function ShapeBase:: determineDamageState( %AmmoDepot ) {

 %curDamage = %AmmoDepot.getDamageLevel();
 %disabledDamage = %AmmoDepot.getDatablock().disabledLevel;
 %destroyedDamage = %AmmoDepot.getDatablock().destroyedLevel;

   if ( %curDamage >= %destroyedDamage ) {
       %AmmoDepot.setDamageState( Destroyed );
       echo( "I have been destroyed!!" );
        }
   else if( %curDamage >= %disabledDamage ) {
       %AmmoDepot.setDamageState( Disabled );
        }
   else {
       %AmmoDepot.setDamageState( Enabled );
        }
}


function AmmoDepot::onDamage(%this, %obj, %delta)
{
}

function AmmoDepot::onDestroyed(%this,%obj,%state)
{
   // Schedule corpse removal.  Just keeping the place clean.
   %obj.schedule($CorpseTimeoutValue - 100, "startFade", 100, 0, true);
   %obj.schedule($CorpseTimeoutValue, "delete");
}