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Feed Forensics — Issue 01
Errors
Google groups variants through item_group_id. When the grouping breaks — mismatched IDs, missing variant attributes, inconsistent families — variants surface as disconnected products or drop out of Shopping entirely. The campaign keeps running. The catalog just gets quietly smaller.
Key finding
0
Google sends when a variant is suppressed by a grouping error — the failure is visible only in Merchant Center diagnostics
Google Merchant Center documentation
FAQ
Q: How do I know if my variants are suppressed? A: Merchant Center's Products > Diagnostics view lists item-level issues. Grouping problems appear as item disapprovals or as variants indexed separately from their family. Q: Should every product get an item_group_id? A: No — only true variants of the same product (same item, different size/color/etc.). Related products, matching sets, and different styles should not share a family. Q: Do all children in a family need the same variant attributes? A: Yes. If the family varies by color, every child needs a valid color value. One blank breaks that SKU out of the group.
8
Variant attributes Google supports for item_group_id families — size, color, material, pattern, age group, gender, size type, size system
50
Character limit on the item_group_id field; every child in a family must carry the identical value
1
Missing variant-attribute value is enough to break a child SKU out of its family
Most variant grouping errors are invisible until you look. The campaign keeps spending; the catalog quietly shrinks.
Lin Grosman
FAQ
Q: How do I know if my variants are suppressed? A: Merchant Center's Products > Diagnostics view lists item-level issues. Grouping problems appear as item disapprovals or as variants indexed separately from their family. Q: Should every product get an item_group_id? A: No — only true variants of the same product (same item, different size/color/etc.). Related products, matching sets, and different styles should not share a family. Q: Do all children in a family need the same variant attributes? A: Yes. If the family varies by color, every child needs a valid color value. One blank breaks that SKU out of the group.
item_group_id requirements and supported variant attributes per Google Merchant Center product data specification.
Inside the guide
How Google builds variant families from item_group_id · The eight supported variant attributes and what each requires from child SKUs · Broken vs. correct grouping, side by side · The suppression and disconnection behaviors bad groupings trigger · Where to see the damage in Merchant Center · Validation as the fix — before submission, not after suppression
8
Variant attributes Google supports for item_group_id families — size, color, material, pattern, age group, gender, size type, size system
50
Character limit on the item_group_id field; every child in a family must carry the identical value
1
Missing variant-attribute value is enough to break a child SKU out of its family
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Drop your feed into Feed X-Ray. The scan flags broken item_group_id families, missing variant attributes, and the SKUs at suppression risk — free, no account needed.