Break boards with hammer and chipper

[Storfigge]

I've made a hammer and a chipper which is located on different maps. Once you have them both you combine them and are suppose to break some boards(wooden_boards_block) covering a door. What am I suppose to write to make this happen? Also I have made an inventory.hps which the hammer and chipper code is in

void hammer_chipper(string &in asItemA, string &in asItemB)
{
PlayGuiSound("15_make_hammer", 1.0f);
RemoveItem(asItemA); RemoveItem(asItemB);
GiveItem("stone_hammer_chipper", "Puzzle", "stone_hammer_chipper", "stone_hammer_chipper.tga", 0);
}



void OnGameStart()
{



AddCombineCallback("hammer_chipper", "stone_hammer_1", "stone_chipper_1", "hammer_chipper", false);

Thanks.