Do not import duplicate SKUs for product variants or single products
This seems to cause problems for OpenStock. OpenCart throws a cryptic fatal error when trying to save a product that has SKUs that already exist for another product, and given that this error occurs then it must be impossible to manually enter duplicate SKUs with the OpenStock module installed.
It may be quite time consuming to check for duplicates so perhaps just do not populate the SKU field at all on import, or add it as an import option.
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Jonathan
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