item_group_id [item_group_id]: Definition

Use the  item_group_id [item_group_id] attribute to group product variants in your product data. Variants are a group of similar items that only differ from one another by product details like size [size], color [colour], material [material], pattern [pattern], age_group [age_group], size_type [size_type], size_system [size_system] and unit_pricing_measure [unit_pricing_measure].

When you use an item_group_id [item_group_id] to group your products, you can ensure that your product and its variants are shown to users as a group, instead of separately. 

When to use

Required for product variants targeting the following countries: 

• Brazil
• France
• Germany
• Japan
• United Kingdom
• United States

Format

Follow these formatting guidelines to make sure that we understand the data that you're submitting. 

Guidelines

Follow these guidelines to make sure that you submit high-quality data for your products and get the best performance from your ads.

Minimum requirements

These are the requirements that you'll need to meet to show ads for your product. If you don't follow these requirements, we'll disapprove your product and let you know on the Diagnostics page of your Merchant Center account. 

• Use the same value of item_group_id [item_group_id] for all variants of the same product. For example, a T-shirt comes in nine variants: three sizes (small, medium and large) and three colours (red, blue and green). Submit each variant as a separate product (e.g. nine separate products), and submit the same value of item_group_id [item_group_id] for each product to indicate that these are variants.
• Each distinct item group must have a unique value for item_group_id [item_group_id].
  • Don't rely on casing to make item_group_id [item_group_id] unique. For example, we interpret the item_group_id [item_group_id]  abc123 and ABC123 as the same product.
  • Don't reuse or recycle the same item_group_id [item_group_id] for different products. 
• Submit a variant attribute along with item_group_id [item_group_id]. So when submitting item_group_id [item_group_id], make sure that your variants use at least one of the variant attributes: color [colour], pattern, [pattern] material [material], age_group [age_group], gender [gender], size [size], size_type [size_type], size_system [size_system] and unit_pricing_measure [unit_pricing_measure].
• Use the same variant attributes for all products with the same item_group_id [item_group_id]. For example, if you submit a dress in two colours and two sizes, each product that you submit must provide a value for the color [colour] attribute and the size [size] attribute. Don't just provide the colour or size for one dress, but not the others.
• Make sure that the product details displayed on your landing page match the values that you provide for each attribute like title [title], color [colour], pattern [pattern], material [material], price [price], availability [availability] and image_link [image_link]. Learn more about requirements for Shopping ads landing pages

Best practices

These are best practices that can help you go beyond the basic requirements to optimise your product data for performance. 

• Use the parent SKU as the item_group_id [item_group_id] for all variants of the same product. Don't submit a parent SKU as a separate product. If you'd like to group variants using a parent SKU, use the parent SKU as the value for item_group_id [item_group_id] for all products in the variant group.
• Don't mix up the item_group_id [item_group_id] and id [id] attributes. Use the id [id] attribute to uniquely identify a single product, and use item_group_id [item_group_id] to group together several products as variants. 
• Don't submit item_group_id [item_group_id] if your product is not a variant. If your product is similar to other products, but not specifically a variant, don't submit item_group_id [item_group_id]. Some examples of products that are not variants include assorted items (a suit consisting of a jacket and pants) or any other set of dissimilar items that are sold together (a set of bath accessories). 
• Use a stable item_group_id [item_group_id] for each group of product variants. Once you've assigned an item_group_id [item_group_id] to a product, don't change it. If item_group_id [item_group_id] changes often, it could cause inconsistency in the way variants are grouped and shown to users.
• Don't use item_group_id [item_group_id] for unsupported variants. If your product varies by an unsupported attribute (such as car make and model), or if your product is a build-to-order custom good with a large number of variants (more than 30), then don't use item_group_id [item_group_id] to indicate your variants. Review best practices for unsupported variants

Examples

General examples

Submit variant details through the variant attributes. For example:

Product	Google logo t-shirt
title [title]	Google logo t-shirt – Small – Red
id [id]	12345-S-R
color [colour]	red
size [size]	S
item_group_id [item_group_id]	12345

 

Product	Google logo t-shirt
title [title]	Google logo t-shirt – Medium – Blue
id [id]	12345-M-B
color [colour]	blue
size [size]	M
item_group_id [item_group_id]	12345

Don't submit variants without variant attributes. For example, don't do this:

Product	Google logo t-shirt
title [title]	Google logo t-shirt – Small – Red
id [id]	12345-S-R
item_group_id [item_group_id]	12345

 

Product	Google logo t-shirt
title [title]	Google logo t-shirt – Small – Blue
id [id]	12345-S-B
item_group_id [item_group_id]	12345