item variables

Can't get the following field values in Custom functions ? .....

VAT (Tax)

Reorder point

Preferred Vendor

Can you help me please Zoho experts ?

And if you could also kindly tell me how to use the correct syntax for the following please, I know you have experts that we can employ but I really enjoy learning & doing it myself :-) ...

myFileID = "123456";

itemName = "myTestItem";

Unit = "box of 10";

mySKU = "54321";

myItemRate = #.##;

pr = #.##;

myCustomField = "abcd"

Item_Details = map();

Item_Details.put("item_type", "inventory");

Item_Details.put("purchase_rate", pr);

//Item_Details.put("zcrm_product_id", "");

Item_Details.put("tax_id", "");

Item_Details.put("unit", Unit);

//Item_Details.put("account_id", "#####000000000###");

Item_Details.put("rate", myItemRate);

Item_Details.put("account_name", "Sales");

Item_Details.put("name", newRange);

Item_Details.put("tax_percentage", 0);

Item_Details.put("SKU", mySKU);

Item_Details.put("status", "active");

Item_Details.put("myCustomFieldName", myCustomField); // would this be correct ?

//info Item_Details;

Response = zoho.books.createRecord("items",myFileID, Item_Details);

info Response;

Been having too many errors, latest being : response = {"code":"2025","message":"Invalid product type"}