请检查以下触发器：

DELIMITER $$

CREATE TRIGGER shop_balance_insert AFTER INSERT ON shop_transfers
FOR EACH ROW
BEGIN

DECLARE PROD_CODE VARCHAR(50);
    DECLARE  SUBCAT_ID  INTEGER;
    DECLARE  COLOR_ID  INTEGER;
    DECLARE  SIZE_ID  INTEGER;

    SELECT product_code,subcat_id,color_id,size_id    INTO  PROD_CODE,SUBCAT_ID,COLOR_ID,SIZE_ID FROM inventories WHERE bar_code =NEW.barcode     LIMIT 0,1;

    INSERT INTO shop_product_balance(product_code, subcat_id,color_id,size_id  ,barcode,shop_id,tbl_name,tbl_date,tbl_primary_key,trns_to_qty,trns_from_qty,sold_qty,return_qty, trnsStatus_st) VALUES
    (PROD_CODE, SUBCAT_ID ,COLOR_ID , SIZE_ID, NEW.barcode, NEW.tshopID,'shop_transfers', NEW.trnsDT, NEW.transferID, NEW.qty,0,0,0,0);

    INSERT INTO shop_product_balance(product_code, subcat_id,color_id,size_id  ,barcode,shop_id,tbl_name,tbl_date,tbl_primary_key,trns_to_qty,trns_from_qty,sold_qty,return_qty, trnsStatus_st) VALUES
    (PROD_CODE, SUBCAT_ID,COLOR_ID , SIZE_ID ,NEW.barcode, NEW.fshopID,'shop_transfers', NEW.trnsDT, NEW.transferID,0, NEW.qty,0,0,1);  

END $$
DELIMITER ;

触发器工作得很好，直到只有一个变量prod\u代码。我最近添加了其他三个变量-subcat，size，color。但是现在-新的三列（subcat、size、color）的值没有显示在表中。其他列的值工作正常。
[注意：列的数据类型与此处声明的相同]
我在声明或设置变量时是否犯了错误。