instant refiner derefine problem

[louigui0224]

i have an instan refiner npc everything works except for derefine it always says thsi item is not available to derefine.

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//    // ==        /==/      /==//=/       /==/    /==/  /==/  /==/     ======/  /   /==/         /==/     /==/
//   //   ==      /==/      /==/  /=/     /==/    /==/  /==/  /==/     / /===/  /   /==/         /==/     /==/
//  //     ==    /==/      /==/   /=/    /==/    /==/  /==/  /==/     / /===/  /   /==/         /==/=====/==/
// //       ==  /==/      /==/    /=/   /==/    /==/  /==/  /==/     /========/   /==/         /==///////==/
// ================ rAthena Script ==================================================
//= Refiner and Repairman made by Rikimaru on rathena.org==//
//=========================================================//
//======== Description ====================================//
//== Easy made Refiner with Repairman for new rAthena =====//
//== Users. Please do not remove theese Credits ===========//
//== Refines the complete Equipment to +100 and repairs ===//
//== All broken items in the Players inventory ============//
//================= Version : =============================//
//============= V. 1.0 Bug Fixes by Rikimaru ==============//
//=========== Credits End =================================//
//===================== Script of Smith/Repairman =========//
turbo_room,90,119,3	script	Smith	63,{
mes "[Smith]";
mes "Hi,I can Refine your";
mes "Equipment to +20";
mes "or Repair your";
mes "Equipment.Also I'm able";
mes "to Derefine your Equipment.";
mes "What do you want from me?";
next;
switch(select("I want a Repair:I want a Refine:I want a Derefine:Nothing")) {
	case 1:
	mes "[Smith]";
	mes "Okay I'm going to repair";
	mes "your Equipment.";
	next;
	while (getbrokenid(1)) {
	repair(1);
	set .@i, .@i +1;
	}
	if (.@i) dispbottom .@i + " items repaired.";
	mes "[Smith]";
	mes "Congrats!Enjoy!";
	close;
	end;
	case 2:
	mes "[Smith]";
	mes "Okay I'm going";
	mes "to refine your Equipment";
	mes "to +20,Thx for using my Service!";
	next;
	for(set @part,1;@part<101;set @part,@part+1) 
	if(getequipisequiped(@part)) 
	while(getequiprefinerycnt(@part) < 20) 
	successrefitem @part;
	mes "[Smith]";
	mes "Congrats Enjoy it!";
	close;
	end;
	case 3:
	mes "[ Smith ]";
	mes "Okay I'm going to Derifne your Equipment now. You need 10.000 Zeny for that.";
	next;
	setarray .@a[1],256,16,32,2,4,64,8,128,512,1;
	select(getequipname(1),getequipname(2),getequipname(3),getequipname(4),getequipname(5),getequipname(6),getequipname(7),getequipname(8),getequipname(9),getequipname(10));
		if ( !getequipisequiped(@menu) ) {
			mes "[ Smith ]";
			mes "There's nothing equipped there...";
			close; }
		if ( zeny < 10000 ) {
			mes "[ Smith ]";
			mes "You don't have enough zeny";
			close; }
		if ( getequiprefinerycnt(@menu) > 10 || getequiprefinerycnt(@menu) == 0 ) {
			mes "[ Smith ]";
			mes "This item cannot be de-refined.";
			close; }
	atcommand "@refine "+ .@a[@menu] +" -90";
	set zeny,zeny - 10000;
	mes "[ Smith ]";
	mes "Your item has de-refined successfully";
	close;
	case 4:
	mes "[ Smith ]";
	mes "Okay,come back when you need me.";
	close;
	}
}