Error Code 20002
The variation theme SIZE specified for SKU [ASG101] is different from the variation theme that already exists for this product in the Amazon catalog. Your variation theme must be identical to, or include the existing theme (STYLE_NAME). For more information, see http://sellercentral.amazon.com/gp/errorcode/20002
If you receive an error code 20002 from Amazon, it means that the variation theme defined for SKU [your SKU] is different from the variation theme that is currently in use for this product in the Amazon catalog. Your variation theme must exactly match the existing variation theme or include it. To upload the product correctly, you must use a variant theme that makes use of or includes this "existing theme." For instance, you must choose a theme that considers both Sizes if the product has a Size and Color variation ("SizeColor" variation).