Option relationship
How sizes, colours, and other choices belong together.

A blue medium can display the right image while carrying the SKU, UPC, GTIN, price, or stock status from another choice. We document the public trail before another mapping change blurs it.
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How sizes, colours, and other choices belong together.
The SKU, UPC, or GTIN attached to each choice.
Whether public price and stock facts agree with the option shown.
Selecting a blue size medium changes the visible price but leaves the product code from the default option. That points to a mapping issue worth confirming.