diff --git a/src/main/java/org/saranghaengbok/models/soap_service.sql b/src/main/java/org/saranghaengbok/models/soap_service.sql
index 430a1488f5c2b61f66acf344b0b8c9f6cecc7548..41ef3df905f5671d9b617a7f7902e71d007f1588 100644
--- a/src/main/java/org/saranghaengbok/models/soap_service.sql
+++ b/src/main/java/org/saranghaengbok/models/soap_service.sql
@@ -14,15 +14,7 @@ CREATE TABLE IF NOT EXISTS `saranghaengbok_soap`.`transaction`(
     `transaction_id` INT NOT NULL AUTO_INCREMENT,
     `buyer_username` VARCHAR(45) NOT NULL,
     `seller_username` VARCHAR(45) NOT NULL,
-    PRIMARY KEY (`transaction_id`)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
-
-CREATE TABLE IF NOT EXISTS `saranghaengbok_soap`.`transaction_items`(
-    `transaction_id` INT NOT NULL, 
     `item_id` INT NOT NULL, 
     `quantity` INT NOT NULL,
-    CONSTRAINT `fk_transaction`
-        FOREIGN KEY (`transaction_id`)
-        REFERENCES `saranghaengbok_soap`.`transaction` (`transaction_id`)
-        ON UPDATE CASCADE
-)ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
+    PRIMARY KEY (`transaction_id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
diff --git a/src/main/java/org/saranghaengbok/service/Transaction.java b/src/main/java/org/saranghaengbok/service/Transaction.java
index 45f2ccb87f78f4016f1518ea25338c6a6e65345c..2c14537f8255ba499b61e5eee8e0c3c0a21694a8 100644
--- a/src/main/java/org/saranghaengbok/service/Transaction.java
+++ b/src/main/java/org/saranghaengbok/service/Transaction.java
@@ -13,7 +13,7 @@ public interface Transaction {
     @WebMethod
     public String createTransaction(
         @WebParam(name = "buyer_username", targetNamespace = "http://service.saranghaengbok.org/") String buyer_username,
-        @WebParam(name = "seller_username", targetNamespace = "http://service.saranghaengbok.org/") String seller_username,
+        @WebParam(name = "seller_username", targetNamespace = "http://service.saranghaengbok.org/") String seller_usernames,
         @WebParam(name = "item_id", targetNamespace = "http://service.saranghaengbok.org/") String list_item_id,
         @WebParam(name = "quantity", targetNamespace = "http://service.saranghaengbok.org/") String list_quantity
     );
diff --git a/src/main/java/org/saranghaengbok/service/TransactionImpl.java b/src/main/java/org/saranghaengbok/service/TransactionImpl.java
index 156b899bb4ca5711bc4dcdafea16c3fad6085594..683893b4e5094c6c3f2d0c95404837053b531123 100644
--- a/src/main/java/org/saranghaengbok/service/TransactionImpl.java
+++ b/src/main/java/org/saranghaengbok/service/TransactionImpl.java
@@ -79,26 +79,21 @@ public class TransactionImpl implements Transaction{
         System.out.println(seller_username);
         System.out.println(list_item_id);
         System.out.println(list_quantity);
-        if ((list_item_id.isEmpty() || Objects.isNull(list_item_id)) &&
-            list_quantity.isEmpty() || Objects.isNull(list_quantity)){
+        if (list_item_id.isEmpty() || Objects.isNull(list_item_id) || list_item_id.equals(" ") ||
+            list_quantity.isEmpty() || Objects.isNull(list_quantity) || list_quantity.equals(" ") ||
+            buyer_username.isEmpty() || Objects.isNull(buyer_username) || buyer_username.equals(" ") || 
+            seller_username.isEmpty() || Objects.isNull(seller_username) || seller_username.equals(" ")){
             return "No item checked out";
         } else {
             try {
                 Statement statement = connection.createStatement();
                 String[] list_item = list_item_id.split(",");
                 String[] quantities = list_quantity.split(",");
-                String query = "INSERT INTO transaction (buyer_username, seller_username) VALUES ('"+ buyer_username + "', '" + seller_username +"')"; 
-                statement.executeUpdate(query);
-                String query1 = "SELECT transaction_id FROM transaction ORDER BY transaction_id DESC LIMIT 1";
-                ResultSet result = statement.executeQuery(query1);
-                int transaction_id = -1;
-                while (result.next()){
-                    transaction_id = result.getInt("transaction_id");
-                }
+                String[] list_seller = seller_username.split(",");
                 for (int i = 0; i < list_item.length; i++) {
-                    String query2 = "INSERT INTO transaction_items (transaction_id, item_id, quantity) VALUES ("+ transaction_id +","+ list_item[i]+","+ quantities[i] +")"; 
-                    statement.executeUpdate(query2);
-                    System.out.printf("transaction_item: %d, item_id: %s, quantity: %s",transaction_id,list_item[i], quantities[i]);
+                    String query = "INSERT INTO transaction (buyer_username, seller_username, item_id, quantity) VALUES ('"+ buyer_username +"','"+ list_seller[i] +"',"+ list_item[i]+","+ quantities[i] +")"; 
+                    statement.executeUpdate(query);
+                    System.out.printf("buyer_username: %s, seller_username:%s, item_id: %s, quantity: %s\n",buyer_username, seller_username, list_item[i], quantities[i]);
                 }
                 statement.close();
                 connection.close();