Getting Duplicate record for only one value in label generator

Hello all, We have created a Label generator in Zoho Creator. The problem we are facing is a duplicate of a record for generating one label. If I have more than one label I won't get duplicate records. I want one record with one label to be generated.

the code we used is

// // col = Collection();

// // for each x in Label_data

// // {

// a = 0;

// b = input.Number_Of_Labels_per_Model;

// // b = 3

// c = if(b < 1,list(),"".leftpad(b - 1).toList(""));

// //c = {,,,};

// for each y in c

// {

// //initiating a row

// // row1 = No_of_Labels.SubForm();

// // row1.Shipped_by = x.Shipped_by;

// // row1.Consignee = x.Consignee;

// // row1.Model_ID = x.Model_ID;

// // row1.No_of_Pieces = x.No_of_Pieces;

// // row1.No_of_Packs = x.No_of_Packs;

// a = a+1;

// row1.Box_Number = a;

// col.insert(row1);

// }

// //}

// input.SubForm.clear();

// input.SubForm.insert(col);

//----------------------------------------

//_______________________

lis = leftpad("t",input.Number_Of_Labels_per_Model - 1).replaceall(" ",",t").toList();

a = 1;

//input.Serial_No = (counter + 1).tostring();

for each rec in lis

{

last_add = Label_data[ID != 0] sort by Added_Time desc;

if(last_add.count() == 0)

{

sn = 1;

}

else

{

sn = ifnull(last_add.Serial_No,0) + 1;

}

insert into Label_data

[

Added_User=zoho.loginuser

Net_Weight_kg=input.Net_Weight_kg

Model_ID=input.Model_ID

No_of_Packs=input.No_of_Packs

Shipped_by=input.Shipped_by

Consignee=input.Consignee

No_of_Pieces=input.No_of_Pieces

Total_Boxs=input.Total_Boxs

Gross_Weight_kg=input.Gross_Weight_kg

Serial_No=sn

Box_Number=a

]

//counter = counter + 1;

}

input.Box_Number = a;

//___________________

last_add = Label_data[ID != 0] sort by Added_Time desc;

if(last_add.count() == 0)

{

sn1 = 1;

}

else

{

sn1 = last_add.Serial_No + 1;

}

input.Serial_No = sn1;

I have attached my output, I'm supposed to get one record. Instead, I'm getting an extra duplicate record. This is happening only for one record maintenance. if I give input >1, no duplicate record is coming.

kindly please help me to solve this issue.