Quality of your Google Product Feed
Shopping campaigns are a better way to use Product Listing Ads and promote your products online using retail-centric tools to manage and optimize your campaigns. With Shopping campaigns, you create product groups based on the attributes for your product data, and then set bids on those product groups. In a Shopping campaign, you subdivide your products based on existing data from the category, brand, item ID, condition, product type, and custom label attributes. You can use custom labels if you want to subdivide the products in your campaign using values of your choosing. For example, you can use custom labels to indicate that products are seasonal, on clearance, best sellers, etc. These values can then be selected to use for monitoring, reporting, and bidding in your Shopping campaign. Learn more about Shopping campaigns. You can create up to five custom labels, numbered 0 through 4, for each item in your feed. You may submit one value per item for each custom label attribute. You should assign a specific definition for each of the five custom labels and specify the possible values for each. Then, you use these custom labels consistently across the products in your Merchant Center account, assigning appropriate values to each product according to your definition. Each of the five custom labels can only have one value per product. As custom labels are meant to allow grouping of items, only 1,000 unique values are supported for each custom label attribute across the items in your account. Products with a custom label submitted after the limit was exceeded won’t be included in product groups using this custom label. To correct the issue, update your product data to reduce the number of unique values for the custom label to less than 1,000.