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This article applies to selling in: Japan

Match your products

The Amazon catalog features products sold by many sellers. To prevent the same product from appearing multiple times and diminishing the customer experience, Amazon uses product matching to find and eliminate duplicate listings.

Product matching helps you match your product to an existing listing. It then adds your offer information to that listing. If a product does not yet exist in the catalog, you can create a new product detail page.

You can make the most of product matching by appropriately classifying your products in the inventory files you upload to the website. When you upload your inventory listings, Amazon runs the data through our matching engine to link your products with the appropriate catalog entry.

Note: For product data feeds, do not use an ASIN in the standard-product-id field or the product-id field. These fields should contain only a ISBN, UPC, EAN, or JAN. We recommend that you always provide the ISBN, UPC, EAN, or JAN when creating a new product page and when searching for existing pages in the Amazon catalog.

Product matching display

A key feature on Amazon is that the same product can be sold by multiple sellers. One seller "wins the Featured offer," while all other sellers appear when the customer clicks "More Buying Choices." The Featured offer winner is determined by a combination of product availability, retail price, and other factors. See The Featured offer for more information.

When customers find a product, they see the product detail page, which includes the Featured offer ("Ready to Buy") and a "More Buying Choices" box (if several sellers offer the same product).

When multiple sellers are selling the same product, the customer can view a list of offers.

Troubleshoot product matching errors

For more information on matching errors, go to Error 8541 and Error 8542.

Here are some possible errors that might occur when matching a product or creating a new product entry:

Multiple products using the same standard ID.

In this case, we cannot determine which entry should be matched to your product. Contact us about this error.

Multiple products using the same product data.

The product data, such as the manufacturer name and manufacturer part number, is not distinctive enough. For example, you submitted a manufacturer name and manufacturer part number that appears to match more than one product. Enter more specific information to find a match.

Same product using multiple SKUs.

A product match was found, but you already have a different SKU associated with it. This can happen if you re-used a SKU previously associated with a different product. To fix this problem, delete the SKU and resubmit the product data.

Adding a new product fails.

If you submit a product, but you do not include the required fields for that product type, you will get an error message and the listing will not be added to the catalog. This ensures that wrongly classified or cataloged products do not appear on the live website. To resolve this problem, re-submit the product with all the required data.

Tips for successful product matching

Use unique standard product identifiers.

Use a standard product identifier when submitting your products. The three top standards are ISBN, UPC, and JAN/EAN. This is the most important and reliable piece of data in the matching process.

Always use a standard ID when creating a new product.

We recommend you use the UPC/EAN. The only time it's incorrect to use a standard ID is in a parent product. If you are creating variations, you should use the standard ID only for the child products. Note: Do not use the ASIN.

Use the manufacturer part numbers issued by the manufacturer.

The manufacturer part number is different from the SKU. The manufacturer part number is the standard by which manufacturers identify their products.

Provide manufacturer name, brand, or publisher.

This data is almost always required to create a new product.

Use the specific attribute fields correctly.

For example, product dimensions such as height, width, and weight should be specified in the Height, Width, and Weight attributes. Do not use general purpose merchandising fields for these values.

Do not re-use SKUs.

If you must change your SKU for a product, do not re-use or recycle old SKUs. Issue a new SKU for the item, and then re-assign the product to the new SKU.

The Amazon.co.jp platform features products sold by many sellers. To prevent the same product from appearing on different pages by different sellers -- which would glut the Amazon.co.jp catalog with redundancies and significantly diminish the customer experience -- Amazon.co.jp uses product matching to find and eliminate duplicate products.

Product matching helps you match a product you want to sell to the corresponding Amazon.co.jp catalog entry, and then adds the product and inventory information to that existing entry. In cases where the product does not yet exist in the Amazon.co.jp catalog, you can create a new product detail page for that product. But in most cases, the products do exist in the Amazon.co.jp catalog, and so you can match your inventory and product data to that existing record.

Benefits of good product matching

If you create a new detail page for an existing product, that detail page might not appear on the more populated detail page, and your offering might simply appear at the bottom of the search results. But when you match your product to the existing detail page, you ensure that customers can find your offering since existing catalog information displays at the top of the search results.

You can leverage product matching simply by appropriately classifying your products in your feeds. When you upload your inventory listings, Amazon runs the data through our matching engine to link your products with the appropriate catalog entry.

Note: For product data feeds, do not use an ASIN in the standard-product-id field or the product-id field. These fields should contain only a ISBN, UPC, EAN and JAN. We recommend that you always provide the ISBN, UPC, EAN and JAN when creating a new product page and when searching for existing pages in the Amazon catalog.

Product Matching Display

A key feature of the Amazon platform is that the same product can be sold by multiple merchants. If several merchants sell the same product, they compete for both product information display and the Featured offer.

The detail page will display the product information contributed by the merchant with the highest Detail Page Control.

The "Featured offer winner" is determined by a combination of product availability, retail price, and other factors. See The Featured offer for more information about how the featured offer winner is selected. All other merchants appear when the customer clicks More Buying Choices, or the next page of the link of New/Used Price.

When customers find a product, they see the product detail page, which includes the featured offer ("Ready to Buy") and a More Buying Choices box (if several merchants offer the same product):

Product Matching Guidelines

Here are some tips for matching for your inventory:

Best Practices

Use unique standard identifiers:

It's a best practice to a standard industry identifier when submitting your products. The three top standards are ISBN, UPC, and EAN/JAN. This is the most important and reliable piece of data in the matching process. We also recommend the UPC/EAN is always used when creating a new product on Amazon.co.jp. The only time it's incorrect to use an identifier is in a parent product; if you are creating variations, you should use the identifier only for the child products. Note that you cannot use the ASIN.

Use the manufacturer part numbers issued by the manufacturer:

The manufacturer part number is different than the SKU. The manufacturer part number is the standard identifier for manufacturers to identify their products.

Supply manufacturer, brand, or publisher:

This data is almost always required to create a new product.

Use the specific attribute fields correctly:

For example, product dimensions such as height, width, and weight should be specified in the Height, Width, and Weight attributes. Do not use general-purpose merchandising fields for these values.

Do not re-use SKUs:

If you must change your SKU for a product, do not re-use or recycle old SKUs. Issue a new SKU for the item, and then re-assign the product to the new SKU.

Errors and Troubleshooting

Here are some possible errors that might occur when matching a product or creating a new product entry:

Product Matching Errors:

If you attempt to match a product and the match fails, the failure might be due to two possible errors:

  • Inconclusive results: The Amazon catalog contains multiple candidate matches for your submitted product, and you did not submit enough data to determine the correct one. There are two possible cases:
    • We found two or more products with the same standard identifiers, such as UPC or EAN, and we cannot determine which entry should be matched to your product. Amazon.co.jp must resolve the data for these UPCs for this UPC to surface on a product detail page. Please use the Contact Us form (at the bottom of this page) to contact your Amazon account manager about the error.
    • The product data (such as the manufacturer and manufacturer part number) you submitted is not discriminating enough. For example, you submitted a manufacturer and manufacturer part number that appears to match more than one product. Enter more specific information to find a match.
  • Same item with multiple SKUs: we matched to a product, but you already have a different SKU associated with it. This can happen if you re-used a SKU previously associated with a different product (that is, perhaps the product is discontinued or deleted). To correct this, delete the SKU and then resubmit.

Product Creation Errors:

If you attempt to create a new product entry and the process fails, the most likely cause for the failure is that you did not submit enough data to create the new product. Typically, a key attribute, such as UPC, manufacturer, brand, and so on, is missing. If you submit a product entry in a data feed but you do not include the required fields for that product, the Amazon platform generates an error message and prevents the product from inclusion in the Amazon catalog. Blocking the inclusion of products without required data ensures that wrongly classified or cataloged products do not appear on the live Web site. To resolve this problem, re-submit the product with a complete product entry.

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