I just found out I have duplicated sku. Not sure how this could happen since AvS_FastSimpleImport with Mage_ImportExport_Model_Import::BEHAVIOR_REPLACE should always replace those products. Looks like I did messup one import last year. All product have the same date for getCreatedAt().

Anyway, if I look at sku attribute config I can not change Unique Value to Yes. Is this not possible in general or only because I have duplicates?


"Unique Value" against SKU should be "yes" by default (and not let you change it). I would suggest that because you have duplicate SKUs, you're having an issue, or that a plugin / update has changed the default behaviour of this attribute.

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