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I Fixed in my website! Please check below process set "const SKU_MAX_LENGTH = 255;" in the file module-catalog/Model/Product/Attribute/Backend/Sku.php You need to change the into database as well. Go to table eav_attribute, search for sku at column attribute code then edit the resulted row. Update the field frontend_class to null or validate-length ...


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Try to update you eav_attribute table UPDATE eav_attribute SET frontend_class = "validate-length maximum-length-11" where attribute_code = 'sku'


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